---
language:
- en
size_categories:
- 1B<n<10B
source_datasets:
- database.lichess.org
task_categories:
- other
paperswithcode_id: lichess_uci
pretty_name: Lichess.org Database in UCI format
tags:
- chess
- UCI
- Lichess
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  - name: whiteelo
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  - name: whiteratingdiff
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  - name: blackratingdiff
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  - name: eco
    dtype: string
  - name: opening
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  - name: timecontrol
    dtype: string
  - name: termination
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    num_bytes: 2439444576
    num_examples: 12458761
  download_size: 788468070
  dataset_size: 2439444576
- config_name: 201709-headers
  features:
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    dtype: string
  - name: site
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  - name: white
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  - name: eco
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  - name: termination
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    num_examples: 12564109
  download_size: 793997640
  dataset_size: 2455202032
- config_name: 201710-headers
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  - name: eco
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    num_examples: 13703878
  download_size: 866679146
  dataset_size: 2674828433
- config_name: 201711-headers
  features:
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  - name: eco
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    num_examples: 14306375
  download_size: 905852052
  dataset_size: 2786778547
- config_name: 201712-headers
  features:
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  download_size: 1019974949
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- config_name: 201801-headers
  features:
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- config_name: 201802-headers
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  - name: eco
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    dtype: string
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    num_bytes: 3381461970
    num_examples: 17383410
  download_size: 1091925690
  dataset_size: 3381461970
- config_name: 201803-headers
  features:
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  - name: eco
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  download_size: 1262596715
  dataset_size: 3895131292
- config_name: 201804-headers
  features:
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- config_name: 201805-headers
  features:
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- config_name: 201807-headers
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- config_name: 201808-headers
  features:
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- config_name: 201809-headers
  features:
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- config_name: 201810-headers
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  - name: whiteratingdiff
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  - name: eco
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    num_bytes: 4786289731
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  download_size: 1560894354
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- config_name: 201811-headers
  features:
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    dtype: string
  - name: site
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  - name: white
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    num_bytes: 5041352140
    num_examples: 26136657
  download_size: 1648180987
  dataset_size: 5041352140
- config_name: 201812-headers
  features:
  - name: event
    dtype: string
  - name: site
    dtype: string
  - name: white
    dtype: string
  - name: black
    dtype: string
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    dtype: string
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  - name: whiteelo
    dtype: int64
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    dtype: int64
  - name: whiteratingdiff
    dtype: float64
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  - name: eco
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    dtype: string
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    num_bytes: 6010737817
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  download_size: 1965121640
  dataset_size: 6010737817
- config_name: 201902-headers
  features:
  - name: event
    dtype: string
  - name: site
    dtype: string
  - name: white
    dtype: string
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    dtype: string
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    dtype: string
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    dtype: string
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    dtype: string
  - name: whiteelo
    dtype: int64
  - name: blackelo
    dtype: int64
  - name: whiteratingdiff
    dtype: float64
  - name: blackratingdiff
    dtype: float64
  - name: eco
    dtype: string
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    dtype: string
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    dtype: string
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    dtype: string
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    num_bytes: 5967271799
    num_examples: 31023718
  download_size: 1951411504
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- config_name: 201903-headers
  features:
  - name: event
    dtype: string
  - name: site
    dtype: string
  - name: white
    dtype: string
  - name: black
    dtype: string
  - name: result
    dtype: string
  - name: utcdate
    dtype: string
  - name: utctime
    dtype: string
  - name: whiteelo
    dtype: int64
  - name: blackelo
    dtype: int64
  - name: whiteratingdiff
    dtype: float64
  - name: blackratingdiff
    dtype: float64
  - name: eco
    dtype: string
  - name: opening
    dtype: string
  - name: timecontrol
    dtype: string
  - name: termination
    dtype: string
  splits:
  - name: train
    num_bytes: 6702633385
    num_examples: 34869171
  download_size: 2192889777
  dataset_size: 6702633385
- config_name: 201904-headers
  features:
  - name: event
    dtype: string
  - name: site
    dtype: string
  - name: white
    dtype: string
  - name: black
    dtype: string
  - name: result
    dtype: string
  - name: utcdate
    dtype: string
  - name: utctime
    dtype: string
  - name: whiteelo
    dtype: int64
  - name: blackelo
    dtype: int64
  - name: whiteratingdiff
    dtype: float64
  - name: blackratingdiff
    dtype: float64
  - name: eco
    dtype: string
  - name: opening
    dtype: string
  - name: timecontrol
    dtype: string
  - name: termination
    dtype: string
  splits:
  - name: train
    num_bytes: 6449604455
    num_examples: 33565536
  download_size: 2110978321
  dataset_size: 6449604455
- config_name: 201906-headers
  features:
  - name: event
    dtype: string
  - name: site
    dtype: string
  - name: white
    dtype: string
  - name: black
    dtype: string
  - name: result
    dtype: string
  - name: utcdate
    dtype: string
  - name: utctime
    dtype: string
  - name: whiteelo
    dtype: int64
  - name: blackelo
    dtype: int64
  - name: whiteratingdiff
    dtype: float64
  - name: blackratingdiff
    dtype: float64
  - name: eco
    dtype: string
  - name: opening
    dtype: string
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    dtype: string
  - name: termination
    dtype: string
  splits:
  - name: train
    num_bytes: 6520743650
    num_examples: 33935786
  download_size: 2135392098
  dataset_size: 6520743650
description: '"The dataset contains games from the Lichess.org open database converted
  from PGN format to UCI format. It is divided into two main configurations: `moves`
  and `headers`. The `moves` configuration includes a UUID called `site` and the UCI
  moves in a column called `transcript`, while the `headers` configuration includes
  metadata such as player ELO ratings, game outcome, and dates. The data is subset
  based on the year and month (yyyymm format)." '
configs:
- config_name: 201301-headers
  data_files:
  - split: train
    path: headers/201301/train-*
- config_name: 201301-moves
  data_files:
  - split: train
    path: data/201301-*
  default: true
- config_name: 201302-headers
  data_files:
  - split: train
    path: headers/201302/train-*
- config_name: 201302-moves
  data_files:
  - split: train
    path: data/201302-*
- config_name: 201303-headers
  data_files:
  - split: train
    path: headers/201303/train-*
- config_name: 201303-moves
  data_files:
  - split: train
    path: data/201303-*
- config_name: 201304-headers
  data_files:
  - split: train
    path: headers/201304/train-*
- config_name: 201304-moves
  data_files:
  - split: train
    path: data/201304-*
- config_name: 201305-headers
  data_files:
  - split: train
    path: headers/201305/train-*
- config_name: 201305-moves
  data_files:
  - split: train
    path: data/201305-*
- config_name: 201306-headers
  data_files:
  - split: train
    path: headers/201306/train-*
- config_name: 201306-moves
  data_files:
  - split: train
    path: data/201306-*
- config_name: 201307-headers
  data_files:
  - split: train
    path: headers/201307/train-*
- config_name: 201307-moves
  data_files:
  - split: train
    path: data/201307-*
- config_name: 201308-headers
  data_files:
  - split: train
    path: headers/201308/train-*
- config_name: 201308-moves
  data_files:
  - split: train
    path: data/201308-*
- config_name: 201309-headers
  data_files:
  - split: train
    path: headers/201309/train-*
- config_name: 201309-moves
  data_files:
  - split: train
    path: data/201309-*
- config_name: 201310-headers
  data_files:
  - split: train
    path: headers/201310/train-*
- config_name: 201310-moves
  data_files:
  - split: train
    path: data/201310-*
- config_name: 201311-headers
  data_files:
  - split: train
    path: headers/201311/train-*
- config_name: 201311-moves
  data_files:
  - split: train
    path: data/201311-*
- config_name: 201312-headers
  data_files:
  - split: train
    path: headers/201312/train-*
- config_name: 201312-moves
  data_files:
  - split: train
    path: data/201312-*
- config_name: 201401-moves
  data_files:
  - split: train
    path: data/201401-*
- config_name: 201402-headers
  data_files:
  - split: train
    path: headers/201402/train-*
- config_name: 201402-moves
  data_files:
  - split: train
    path: data/201402-*
- config_name: 201403-headers
  data_files:
  - split: train
    path: headers/201403/train-*
- config_name: 201403-moves
  data_files:
  - split: train
    path: data/201403-*
- config_name: 201404-headers
  data_files:
  - split: train
    path: headers/201404/train-*
- config_name: 201404-moves
  data_files:
  - split: train
    path: data/201404-*
- config_name: 201405-headers
  data_files:
  - split: train
    path: headers/201405/train-*
- config_name: 201405-moves
  data_files:
  - split: train
    path: data/201405-*
- config_name: 201406-headers
  data_files:
  - split: train
    path: headers/201406/train-*
- config_name: 201406-moves
  data_files:
  - split: train
    path: data/201406-*
- config_name: 201407-headers
  data_files:
  - split: train
    path: headers/201407/train-*
- config_name: 201407-moves
  data_files:
  - split: train
    path: data/201407-*
- config_name: 201408-headers
  data_files:
  - split: train
    path: headers/201408/train-*
- config_name: 201408-moves
  data_files:
  - split: train
    path: data/201408-*
- config_name: 201409-headers
  data_files:
  - split: train
    path: headers/201409/train-*
- config_name: 201409-moves
  data_files:
  - split: train
    path: data/201409-*
- config_name: 201410-headers
  data_files:
  - split: train
    path: headers/201410/train-*
- config_name: 201410-moves
  data_files:
  - split: train
    path: data/201410-*
- config_name: 201411-headers
  data_files:
  - split: train
    path: headers/201411/train-*
- config_name: 201411-moves
  data_files:
  - split: train
    path: data/201411-*
- config_name: 201412-headers
  data_files:
  - split: train
    path: headers/201412/train-*
- config_name: 201412-moves
  data_files:
  - split: train
    path: data/201412-*
- config_name: 201501-headers
  data_files:
  - split: train
    path: headers/201501/train-*
- config_name: 201501-moves
  data_files:
  - split: train
    path: data/201501-*
- config_name: 201502-headers
  data_files:
  - split: train
    path: headers/201502/train-*
- config_name: 201502-moves
  data_files:
  - split: train
    path: data/201502-*
- config_name: 201503-headers
  data_files:
  - split: train
    path: headers/201503/train-*
- config_name: 201503-moves
  data_files:
  - split: train
    path: data/201503-*
- config_name: 201504-headers
  data_files:
  - split: train
    path: headers/201504/train-*
- config_name: 201504-moves
  data_files:
  - split: train
    path: data/201504-*
- config_name: 201505-headers
  data_files:
  - split: train
    path: headers/201505/train-*
- config_name: 201505-moves
  data_files:
  - split: train
    path: data/201505-*
- config_name: 201506-headers
  data_files:
  - split: train
    path: headers/201506/train-*
- config_name: 201506-moves
  data_files:
  - split: train
    path: data/201506-*
- config_name: 201507-headers
  data_files:
  - split: train
    path: headers/201507/train-*
- config_name: 201507-moves
  data_files:
  - split: train
    path: data/201507-*
- config_name: 201508-headers
  data_files:
  - split: train
    path: headers/201508/train-*
- config_name: 201508-moves
  data_files:
  - split: train
    path: data/201508-*
- config_name: 201509-headers
  data_files:
  - split: train
    path: headers/201509/train-*
- config_name: 201509-moves
  data_files:
  - split: train
    path: data/201509-*
- config_name: 201510-headers
  data_files:
  - split: train
    path: headers/201510/train-*
- config_name: 201510-moves
  data_files:
  - split: train
    path: data/201510-*
- config_name: 201511-headers
  data_files:
  - split: train
    path: headers/201511/train-*
- config_name: 201511-moves
  data_files:
  - split: train
    path: data/201511-*
- config_name: 201512-headers
  data_files:
  - split: train
    path: headers/201512/train-*
- config_name: 201512-moves
  data_files:
  - split: train
    path: data/201512-*
- config_name: 201601-headers
  data_files:
  - split: train
    path: headers/201601/train-*
- config_name: 201601-moves
  data_files:
  - split: train
    path: data/201601-*
- config_name: 201602-headers
  data_files:
  - split: train
    path: headers/201602/train-*
- config_name: 201602-moves
  data_files:
  - split: train
    path: data/201602-*
- config_name: 201603-headers
  data_files:
  - split: train
    path: headers/201603/train-*
- config_name: 201603-moves
  data_files:
  - split: train
    path: data/201603-*
- config_name: 201604-headers
  data_files:
  - split: train
    path: headers/201604/train-*
- config_name: 201604-moves
  data_files:
  - split: train
    path: data/201604-*
- config_name: 201605-headers
  data_files:
  - split: train
    path: headers/201605/train-*
- config_name: 201605-moves
  data_files:
  - split: train
    path: data/201605-*
- config_name: 201606-headers
  data_files:
  - split: train
    path: headers/201606/train-*
- config_name: 201606-moves
  data_files:
  - split: train
    path: data/201606-*
- config_name: 201607-headers
  data_files:
  - split: train
    path: headers/201607/train-*
- config_name: 201607-moves
  data_files:
  - split: train
    path: data/201607-*
- config_name: 201608-headers
  data_files:
  - split: train
    path: headers/201608/train-*
- config_name: 201608-moves
  data_files:
  - split: train
    path: data/201608-*
- config_name: 201609-headers
  data_files:
  - split: train
    path: headers/201609/train-*
- config_name: 201609-moves
  data_files:
  - split: train
    path: data/201609-*
- config_name: 201610-headers
  data_files:
  - split: train
    path: headers/201610/train-*
- config_name: 201610-moves
  data_files:
  - split: train
    path: data/201610-*
- config_name: 201611-headers
  data_files:
  - split: train
    path: headers/201611/train-*
- config_name: 201611-moves
  data_files:
  - split: train
    path: data/201611-*
- config_name: 201612-headers
  data_files:
  - split: train
    path: headers/201612/train-*
- config_name: 201612-moves
  data_files:
  - split: train
    path: data/201612-*
- config_name: 201701-headers
  data_files:
  - split: train
    path: headers/201701/train-*
- config_name: 201701-moves
  data_files:
  - split: train
    path: data/201701-*
- config_name: 201702-headers
  data_files:
  - split: train
    path: headers/201702/train-*
- config_name: 201702-moves
  data_files:
  - split: train
    path: data/201702-*
- config_name: 201703-headers
  data_files:
  - split: train
    path: headers/201703/train-*
- config_name: 201703-moves
  data_files:
  - split: train
    path: data/201703-*
- config_name: 201704-headers
  data_files:
  - split: train
    path: headers/201704/train-*
- config_name: 201704-moves
  data_files:
  - split: train
    path: data/201704-*
- config_name: 201705-headers
  data_files:
  - split: train
    path: headers/201705/train-*
- config_name: 201705-moves
  data_files:
  - split: train
    path: data/201705-*
- config_name: 201706-headers
  data_files:
  - split: train
    path: headers/201706/train-*
- config_name: 201706-moves
  data_files:
  - split: train
    path: data/201706-*
- config_name: 201707-headers
  data_files:
  - split: train
    path: headers/201707/train-*
- config_name: 201707-moves
  data_files:
  - split: train
    path: data/201707-*
- config_name: 201708-headers
  data_files:
  - split: train
    path: headers/201708/train-*
- config_name: 201708-moves
  data_files:
  - split: train
    path: data/201708-*
- config_name: 201709-headers
  data_files:
  - split: train
    path: headers/201709/train-*
- config_name: 201709-moves
  data_files:
  - split: train
    path: data/201709-*
- config_name: 201710-headers
  data_files:
  - split: train
    path: headers/201710/train-*
- config_name: 201710-moves
  data_files:
  - split: train
    path: data/201710-*
- config_name: 201711-headers
  data_files:
  - split: train
    path: headers/201711/train-*
- config_name: 201711-moves
  data_files:
  - split: train
    path: data/201711-*
- config_name: 201712-headers
  data_files:
  - split: train
    path: headers/201712/train-*
- config_name: 201712-moves
  data_files:
  - split: train
    path: data/201712-*
- config_name: 201801-headers
  data_files:
  - split: train
    path: headers/201801/train-*
- config_name: 201801-moves
  data_files:
  - split: train
    path: data/201801-*
- config_name: 201802-headers
  data_files:
  - split: train
    path: headers/201802/train-*
- config_name: 201802-moves
  data_files:
  - split: train
    path: data/201802-*
- config_name: 201803-headers
  data_files:
  - split: train
    path: headers/201803/train-*
- config_name: 201803-moves
  data_files:
  - split: train
    path: data/201803-*
- config_name: 201804-headers
  data_files:
  - split: train
    path: headers/201804/train-*
- config_name: 201804-moves
  data_files:
  - split: train
    path: data/201804-*
- config_name: 201805-headers
  data_files:
  - split: train
    path: headers/201805/train-*
- config_name: 201805-moves
  data_files:
  - split: train
    path: data/201805-*
- config_name: 201806-headers
  data_files:
  - split: train
    path: headers/201806/train-*
- config_name: 201806-moves
  data_files:
  - split: train
    path: data/201806-*
- config_name: 201807-headers
  data_files:
  - split: train
    path: headers/201807/train-*
- config_name: 201807-moves
  data_files:
  - split: train
    path: data/201807-*
- config_name: 201808-headers
  data_files:
  - split: train
    path: headers/201808/train-*
- config_name: 201808-moves
  data_files:
  - split: train
    path: data/201808-*
- config_name: 201809-headers
  data_files:
  - split: train
    path: headers/201809/train-*
- config_name: 201809-moves
  data_files:
  - split: train
    path: data/201809-*
- config_name: 201810-headers
  data_files:
  - split: train
    path: headers/201810/train-*
- config_name: 201810-moves
  data_files:
  - split: train
    path: data/201810-*
- config_name: 201811-headers
  data_files:
  - split: train
    path: headers/201811/train-*
- config_name: 201811-moves
  data_files:
  - split: train
    path: data/201811-*
- config_name: 201812-headers
  data_files:
  - split: train
    path: headers/201812/train-*
- config_name: 201812-moves
  data_files:
  - split: train
    path: data/201812-*
- config_name: 201901-moves
  data_files:
  - split: train
    path: data/201901-*
- config_name: 201902-headers
  data_files:
  - split: train
    path: headers/201902/train-*
- config_name: 201902-moves
  data_files:
  - split: train
    path: data/201902-*
- config_name: 201903-headers
  data_files:
  - split: train
    path: headers/201903/train-*
- config_name: 201903-moves
  data_files:
  - split: train
    path: data/201903-*
- config_name: 201904-headers
  data_files:
  - split: train
    path: headers/201904/train-*
- config_name: 201904-moves
  data_files:
  - split: train
    path: data/201904-*
- config_name: 201905-moves
  data_files:
  - split: train
    path: data/201905-*
- config_name: 201906-headers
  data_files:
  - split: train
    path: headers/201906/train-*
- config_name: 201906-moves
  data_files:
  - split: train
    path: data/201906-*
- config_name: 201907-moves
  data_files:
  - split: train
    path: data/201907-*
- config_name: 201908-moves
  data_files:
  - split: train
    path: data/201908-*
- config_name: 201909-moves
  data_files:
  - split: train
    path: data/201909-*
- config_name: 201910-moves
  data_files:
  - split: train
    path: data/201910-*
- config_name: 201911-moves
  data_files:
  - split: train
    path: data/201911-*
- config_name: 201912-moves
  data_files:
  - split: train
    path: data/201912-*
- config_name: 202001-moves
  data_files:
  - split: train
    path: data/202001-*
- config_name: 202002-moves
  data_files:
  - split: train
    path: data/202002-*
- config_name: 202003-moves
  data_files:
  - split: train
    path: data/202003-*
- config_name: 202004-moves
  data_files:
  - split: train
    path: data/202004-*
- config_name: 202005-moves
  data_files:
  - split: train
    path: data/202005-*
- config_name: 202006-moves
  data_files:
  - split: train
    path: data/202006-*
- config_name: 202007-moves
  data_files:
  - split: train
    path: data/202007-*
- config_name: 202008-moves
  data_files:
  - split: train
    path: data/202008-*
- config_name: 202009-moves
  data_files:
  - split: train
    path: data/202009-*
- config_name: 202010-moves
  data_files:
  - split: train
    path: data/202010-*
- config_name: 202011-moves
  data_files:
  - split: train
    path: data/202011-*
- config_name: 202012-moves
  data_files:
  - split: train
    path: data/202012-*
- config_name: 202101-moves
  data_files:
  - split: train
    path: data/202101-*
- config_name: 202102-moves
  data_files:
  - split: train
    path: data/202102-*
- config_name: 202103-moves
  data_files:
  - split: train
    path: data/202103-*
- config_name: 202104-moves
  data_files:
  - split: train
    path: data/202104-*
- config_name: 202105-moves
  data_files:
  - split: train
    path: data/202105-*
- config_name: 202106-moves
  data_files:
  - split: train
    path: data/202106-*
- config_name: 202107-moves
  data_files:
  - split: train
    path: data/202107-*
- config_name: 202108-moves
  data_files:
  - split: train
    path: data/202108-*
- config_name: 202109-moves
  data_files:
  - split: train
    path: data/202109-*
- config_name: 202110-moves
  data_files:
  - split: train
    path: data/202110-*
- config_name: 202111-moves
  data_files:
  - split: train
    path: data/202111-*
- config_name: 202112-moves
  data_files:
  - split: train
    path: data/202112-*
- config_name: 202201-moves
  data_files:
  - split: train
    path: data/202201-*
- config_name: 202202-moves
  data_files:
  - split: train
    path: data/202202-*
- config_name: 202203-moves
  data_files:
  - split: train
    path: data/202203-*
- config_name: 202204-moves
  data_files:
  - split: train
    path: data/202204-*
- config_name: 202205-moves
  data_files:
  - split: train
    path: data/202205-*
- config_name: 202206-moves
  data_files:
  - split: train
    path: data/202206-*
- config_name: 202207-moves
  data_files:
  - split: train
    path: data/202207-*
- config_name: 202208-moves
  data_files:
  - split: train
    path: data/202208-*
- config_name: 202209-moves
  data_files:
  - split: train
    path: data/202209-*
- config_name: 202210-moves
  data_files:
  - split: train
    path: data/202210-*
- config_name: 202211-moves
  data_files:
  - split: train
    path: data/202211-*
- config_name: 202212-moves
  data_files:
  - split: train
    path: data/202212-*
- config_name: 202301-moves
  data_files:
  - split: train
    path: data/202301-*
- config_name: 202302-moves
  data_files:
  - split: train
    path: data/202302-*
- config_name: 202303-moves
  data_files:
  - split: train
    path: data/202303-*
- config_name: 202304-moves
  data_files:
  - split: train
    path: data/202304-*
- config_name: 202305-moves
  data_files:
  - split: train
    path: data/202305-*
- config_name: 202306-moves
  data_files:
  - split: train
    path: data/202306-*
- config_name: 202307-moves
  data_files:
  - split: train
    path: data/202307-*
- config_name: 202308-moves
  data_files:
  - split: train
    path: data/202308-*
- config_name: 202309-moves
  data_files:
  - split: train
    path: data/202309-*
- config_name: 202310-moves
  data_files:
  - split: train
    path: data/202310-*
- config_name: 202311-moves
  data_files:
  - split: train
    path: data/202311-*
- config_name: 202312-moves
  data_files:
  - split: train
    path: data/202312-*
- config_name: 202401-moves
  data_files:
  - split: train
    path: data/202401-*
- config_name: 202402-moves
  data_files:
  - split: train
    path: data/202402-*
example:
  moves:
    site: xxxxxxx
    transcript: e2e4 e7e5 g1f3 b8c6
  headers:
    event: Rated Blitz game
    site: xxxxxxx
    white: player1
    black: player2
    result: 1-0
    utcdate: '2023-05-21'
    utctime: '13:45:00'
    whiteelo: 1500
    blackelo: 1400
    whiteratingdiff: 10
    blackratingdiff: -10
    eco: C50
    opening: Italian Game
    timecontrol: 300+0
    termination: Normal
---

# Dataset Card for Lichess.org Database in UCI format

## Table of Contents
- [Table of Contents](#table-of-contents)
- [Dataset Description](#dataset-description)
  - [Dataset Summary](#dataset-summary)
  - [Supported Tasks and Leaderboards](#supported-tasks-and-leaderboards)
- [Dataset Structure](#dataset-structure)
  - [Data Instances](#data-instances)
  - [Data Fields](#data-fields)
  - [Data Splits](#data-splits)
- [Dataset Creation](#dataset-creation)
  - [Curation Rationale](#curation-rationale)
  - [Source Data](#source-data)
  - [Annotations](#annotations)
  - [Personal and Sensitive Information](#personal-and-sensitive-information)
- [Considerations for Using the Data](#considerations-for-using-the-data)
  - [Social Impact of Dataset](#social-impact-of-dataset)
  - [Discussion of Biases](#discussion-of-biases)
  - [Other Known Limitations](#other-known-limitations)
- [Additional Information](#additional-information)
  - [Dataset Curators](#dataset-curators)
  - [Licensing Information](#licensing-information)
  - [Citation Information](#citation-information)
  - [Contributions](#contributions)

## Dataset Description
<!-- 
- **Homepage:** [Lichess.org Database](https://database.lichess.org/)
- **Repository:** [GitHub Repository](https://github.com/lichess-org/database)
- **Paper:** N/A
- **Leaderboard:** N/A
- **Point of Contact:** [Contact Lichess](https://lichess.org/contact) -->

### Dataset Summary

The Lichess.org database has been converted to UCI format, making it easier to analyze and interpret chess games. 
The `moves` configuration captures the sequence of moves using UCI notation, and the `headers` configuration provides 
comprehensive metadata for each game, enabling detailed statistical and strategic analysis. The data is subset based on 
the year and month (yyyymm format) the games took place.

### Supported Tasks and Leaderboards

This dataset supports tasks related to chess game analysis, including move prediction, game outcome prediction, performance 
analysis, and opening strategy evaluation. There are no formal leaderboards associated with this dataset.

## Dataset Structure

### Data Instances

An example from the `moves` configuration:
```json
{
  "site": "abcd1234",
  "transcript": "e2e4 e7e5 g1f3 b8c6"
}
```

An example from the `headers` configuration:
```json
{
  "event": "Rated Blitz game",
  "site": "abcd1234",
  "white": "player1",
  "black": "player2",
  "result": "1-0",
  "utcdate": "2023-05-21",
  "utctime": "13:45:00",
  "whiteelo": 1500,
  "blackelo": 1400,
  "whiteratingdiff": 10,
  "blackratingdiff": -10,
  "eco": "C50",
  "opening": "Italian Game",
  "timecontrol": "300+0",
  "termination": "Normal"
}
```

### Data Fields

#### Moves Configuration:
- `site`: string, unique identifier for the game. Replays can be viewed by navigating to `https://lichess.org/<site>`
- `transcript`: string, sequence of moves in UCI format.

#### Headers Configuration:
- `event`: string, type of event.
- `site`: string, unique identifier for the game.
- `white`: string, white player.
- `black`: string, black player.
- `result`: string, game result.
- `utcdate`: date32, date of the game.
- `utctime`: time64[us], time of the game.
- `whiteelo`: int64, ELO rating of the white player.
- `blackelo`: int64, ELO rating of the black player.
- `whiteratingdiff`: float64, rating change for the white player.
- `blackratingdiff`: float64, rating change for the black player.
- `eco`: string, ECO code of the opening.
- `opening`: string, name of the opening.
- `timecontrol`: string, time control format.
- `termination`: string, reason for game termination.

### Data Splits

The dataset is divided into monthly splits based on the year and month (yyyymm format). Each split contains both `moves` and `headers` configurations.

## Dataset Creation

### Curation Rationale

The dataset was curated to facilitate research and analysis that use chess games, providing both move sequences and comprehensive metadata. 

### Source Data

#### Initial Data Collection and Normalization

The data was collected from the Lichess.org open database, converted from PGN format to UCI format, and organized into `moves` and `headers` configurations.

#### Who are the source data producers?

The source data comes from games played on Lichess.org, an online platform where users from around the world play chess.
This database does not distinguish between human-and bot-played games. 
However, it's reasonable to assume games played before April 2018 were overwhelmingly played by human players since Lichess.org 
released its [bot api](https://github.com/lichess-org/api) on April 1st, 2018.

### Annotations

#### Annotation process

The annotations include metadata such as player ELO ratings, game outcomes, and dates, which were extracted from the original 
PGN files and normalized into a structured format.

#### Who are the annotators?

The annotations were generated by the Lichess.org platform and curated by the dataset creators.

### Personal and Sensitive Information

The dataset does not contain any personal or sensitive information.

## Considerations for Using the Data

### Social Impact of Dataset

The dataset can be used to improve chess engines, develop training tools for players, and conduct research in game theory and artificial intelligence.

### Discussion of Biases

The dataset may have biases related to the demographics of Lichess.org users, such as skill level distribution and regional representation.

### Other Known Limitations

The dataset is limited to games played on Lichess.org and may not represent the broader chess-playing population.

## Additional Information

### Dataset Curators

The dataset was curated by the Lichess.org team and contributors.

### Licensing Information

The dataset is available under the Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

### Citation Information

If you use this dataset, please cite it as follows:

```
@misc{lichess_uci,
  author = {Davis, Austin L.},
  title = {Lichess.org Database in UCI format},
  year = {2023},
  howpublished = {\url{https://database.lichess.org/}},
}
```

### Contributions

Thanks to [@austinleedavis](https://github.com/austinleedavis) for adding this dataset.---
language:
- en
size_categories:
- 1B<n<10B
source_datasets:
- database.lichess.org
task_categories:
- other
paperswithcode_id: lichess_uci
pretty_name: Lichess.org Database in UCI format
tags:
- chess
- UCI
- Lichess
dataset_info:
- config_name: 201301-headers
  features:
  - name: event
    dtype: string
  - name: site
    dtype: string
  - name: white
    dtype: string
  - name: black
    dtype: string
  - name: result
    dtype: string
  - name: utcdate
    dtype: date32
  - name: utctime
    dtype: time64[us]
  - name: whiteelo
    dtype: int64
  - name: blackelo
    dtype: int64
  - name: whiteratingdiff
    dtype: float64
  - name: blackratingdiff
    dtype: float64
  - name: eco
    dtype: string
  - name: opening
    dtype: string
  - name: timecontrol
    dtype: string
  - name: termination
    dtype: string
  splits:
  - name: train
    num_bytes: 20700133
    num_examples: 121332
  download_size: 6335452
  dataset_size: 20700133
- config_name: 201301-moves
  features:
  - name: site
    dtype: string
  - name: transcript
    dtype: string
  splits:
  - name: train
    num_bytes: 42454117.656856485
    num_examples: 120133
  download_size: 992204415449
  dataset_size: 1636203333850.0193
- config_name: 201302-headers
  features:
  - name: event
    dtype: string
  - name: site
    dtype: string
  - name: white
    dtype: string
  - name: black
    dtype: string
  - name: result
    dtype: string
  - name: utcdate
    dtype: date32
  - name: utctime
    dtype: time64[us]
  - name: whiteelo
    dtype: int64
  - name: blackelo
    dtype: int64
  - name: whiteratingdiff
    dtype: float64
  - name: blackratingdiff
    dtype: float64
  - name: eco
    dtype: string
  - name: opening
    dtype: string
  - name: timecontrol
    dtype: string
  - name: termination
    dtype: string
  splits:
  - name: train
    num_bytes: 21155456
    num_examples: 123961
  download_size: 6487839
  dataset_size: 21155456
- config_name: 201303-headers
  features:
  - name: event
    dtype: string
  - name: site
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  - name: white
    dtype: string
  - name: black
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  - name: result
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  - name: utcdate
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  - name: utctime
    dtype: time64[us]
  - name: whiteelo
    dtype: int64
  - name: blackelo
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  - name: whiteratingdiff
    dtype: float64
  - name: blackratingdiff
    dtype: float64
  - name: eco
    dtype: string
  - name: opening
    dtype: string
  - name: timecontrol
    dtype: string
  - name: termination
    dtype: string
  splits:
  - name: train
    num_bytes: 27026323
    num_examples: 158635
  download_size: 8300668
  dataset_size: 27026323
- config_name: 201304-headers
  features:
  - name: event
    dtype: string
  - name: site
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  - name: white
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  - name: black
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  - name: result
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  - name: utcdate
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  - name: utctime
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  - name: whiteelo
    dtype: int64
  - name: blackelo
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  - name: whiteratingdiff
    dtype: float64
  - name: blackratingdiff
    dtype: float64
  - name: eco
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  - name: opening
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  - name: timecontrol
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  - name: termination
    dtype: string
  splits:
  - name: train
    num_bytes: 27075305
    num_examples: 157871
  download_size: 8357025
  dataset_size: 27075305
- config_name: 201305-headers
  features:
  - name: event
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  - name: site
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  - name: white
    dtype: string
  - name: black
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  - name: result
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  - name: utcdate
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  - name: utctime
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  - name: whiteelo
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  - name: blackelo
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  - name: whiteratingdiff
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  - name: blackratingdiff
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  - name: eco
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  - name: opening
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  - name: termination
    dtype: string
  splits:
  - name: train
    num_bytes: 30787801
    num_examples: 179550
  download_size: 9499827
  dataset_size: 30787801
- config_name: 201306-headers
  features:
  - name: event
    dtype: string
  - name: site
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  - name: white
    dtype: string
  - name: black
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  - name: result
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  - name: utcdate
    dtype: date32
  - name: utctime
    dtype: time64[us]
  - name: whiteelo
    dtype: int64
  - name: blackelo
    dtype: int64
  - name: whiteratingdiff
    dtype: float64
  - name: blackratingdiff
    dtype: float64
  - name: eco
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  - name: opening
    dtype: string
  - name: timecontrol
    dtype: string
  - name: termination
    dtype: string
  splits:
  - name: train
    num_bytes: 38460608
    num_examples: 224679
  download_size: 12011278
  dataset_size: 38460608
- config_name: 201307-headers
  features:
  - name: event
    dtype: string
  - name: site
    dtype: string
  - name: white
    dtype: string
  - name: black
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  - name: result
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  - name: utcdate
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  - name: utctime
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  - name: whiteelo
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  - name: blackelo
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  - name: whiteratingdiff
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  - name: blackratingdiff
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  - name: eco
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  - name: opening
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  - name: timecontrol
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  - name: termination
    dtype: string
  splits:
  - name: train
    num_bytes: 50175383
    num_examples: 293459
  download_size: 15746824
  dataset_size: 50175383
- config_name: 201308-headers
  features:
  - name: event
    dtype: string
  - name: site
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  - name: white
    dtype: string
  - name: black
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  - name: result
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  - name: utcdate
    dtype: date32
  - name: utctime
    dtype: time64[us]
  - name: whiteelo
    dtype: int64
  - name: blackelo
    dtype: int64
  - name: whiteratingdiff
    dtype: float64
  - name: blackratingdiff
    dtype: float64
  - name: eco
    dtype: string
  - name: opening
    dtype: string
  - name: timecontrol
    dtype: string
  - name: termination
    dtype: string
  splits:
  - name: train
    num_bytes: 55757812
    num_examples: 325525
  download_size: 17532132
  dataset_size: 55757812
- config_name: 201309-headers
  features:
  - name: event
    dtype: string
  - name: site
    dtype: string
  - name: white
    dtype: string
  - name: black
    dtype: string
  - name: result
    dtype: string
  - name: utcdate
    dtype: date32
  - name: utctime
    dtype: time64[us]
  - name: whiteelo
    dtype: int64
  - name: blackelo
    dtype: int64
  - name: whiteratingdiff
    dtype: float64
  - name: blackratingdiff
    dtype: float64
  - name: eco
    dtype: string
  - name: opening
    dtype: string
  - name: timecontrol
    dtype: string
  - name: termination
    dtype: string
  splits:
  - name: train
    num_bytes: 55675760
    num_examples: 325098
  download_size: 17609637
  dataset_size: 55675760
- config_name: 201310-headers
  features:
  - name: event
    dtype: string
  - name: site
    dtype: string
  - name: white
    dtype: string
  - name: black
    dtype: string
  - name: result
    dtype: string
  - name: utcdate
    dtype: date32
  - name: utctime
    dtype: time64[us]
  - name: whiteelo
    dtype: int64
  - name: blackelo
    dtype: int64
  - name: whiteratingdiff
    dtype: float64
  - name: blackratingdiff
    dtype: float64
  - name: eco
    dtype: string
  - name: opening
    dtype: string
  - name: timecontrol
    dtype: string
  - name: termination
    dtype: string
  splits:
  - name: train
    num_bytes: 70482274
    num_examples: 411039
  download_size: 22045781
  dataset_size: 70482274
- config_name: 201312-headers
  features:
  - name: event
    dtype: string
  - name: site
    dtype: string
  - name: white
    dtype: string
  - name: black
    dtype: string
  - name: result
    dtype: string
  - name: utcdate
    dtype: date32
  - name: utctime
    dtype: time64[us]
  - name: whiteelo
    dtype: int64
  - name: blackelo
    dtype: int64
  - name: whiteratingdiff
    dtype: float64
  - name: blackratingdiff
    dtype: float64
  - name: eco
    dtype: string
  - name: opening
    dtype: string
  - name: timecontrol
    dtype: string
  - name: termination
    dtype: string
  splits:
  - name: train
    num_bytes: 99283116
    num_examples: 578262
  download_size: 31618717
  dataset_size: 99283116
- config_name: 201409-headers
  features:
  - name: event
    dtype: string
  - name: site
    dtype: string
  - name: white
    dtype: string
  - name: black
    dtype: string
  - name: result
    dtype: string
  - name: utcdate
    dtype: string
  - name: utctime
    dtype: string
  - name: whiteelo
    dtype: int64
  - name: blackelo
    dtype: int64
  - name: whiteratingdiff
    dtype: float64
  - name: blackratingdiff
    dtype: float64
  - name: eco
    dtype: string
  - name: opening
    dtype: string
  - name: timecontrol
    dtype: string
  - name: termination
    dtype: string
  splits:
  - name: train
    num_bytes: 189380199
    num_examples: 1000056
  download_size: 55076845
  dataset_size: 189380199
description: '"The dataset contains games from the Lichess.org open database converted
  from PGN format to UCI format. It is divided into two main configurations: `moves`
  and `headers`. The `moves` configuration includes a UUID called `site` and the UCI
  moves in a column called `transcript`, while the `headers` configuration includes
  metadata such as player ELO ratings, game outcome, and dates. The data is subset
  based on the year and month (yyyymm format)." '
configs:
- config_name: 201301-headers
  data_files:
  - split: train
    path: headers/201301/train-*
- config_name: 201301-moves
  data_files:
  - split: train
    path: data/201301-*
  default: true
- config_name: 201302-headers
  data_files:
  - split: train
    path: headers/201302/train-*
- config_name: 201302-moves
  data_files:
  - split: train
    path: data/201302-*
- config_name: 201303-headers
  data_files:
  - split: train
    path: headers/201303/train-*
- config_name: 201303-moves
  data_files:
  - split: train
    path: data/201303-*
- config_name: 201304-headers
  data_files:
  - split: train
    path: headers/201304/train-*
- config_name: 201304-moves
  data_files:
  - split: train
    path: data/201304-*
- config_name: 201305-headers
  data_files:
  - split: train
    path: headers/201305/train-*
- config_name: 201305-moves
  data_files:
  - split: train
    path: data/201305-*
- config_name: 201306-headers
  data_files:
  - split: train
    path: headers/201306/train-*
- config_name: 201306-moves
  data_files:
  - split: train
    path: data/201306-*
- config_name: 201307-headers
  data_files:
  - split: train
    path: headers/201307/train-*
- config_name: 201307-moves
  data_files:
  - split: train
    path: data/201307-*
- config_name: 201308-headers
  data_files:
  - split: train
    path: headers/201308/train-*
- config_name: 201308-moves
  data_files:
  - split: train
    path: data/201308-*
- config_name: 201309-headers
  data_files:
  - split: train
    path: headers/201309/train-*
- config_name: 201309-moves
  data_files:
  - split: train
    path: data/201309-*
- config_name: 201310-headers
  data_files:
  - split: train
    path: headers/201310/train-*
- config_name: 201310-moves
  data_files:
  - split: train
    path: data/201310-*
- config_name: 201311-moves
  data_files:
  - split: train
    path: data/201311-*
- config_name: 201312-headers
  data_files:
  - split: train
    path: headers/201312/train-*
- config_name: 201312-moves
  data_files:
  - split: train
    path: data/201312-*
- config_name: 201401-moves
  data_files:
  - split: train
    path: data/201401-*
- config_name: 201402-moves
  data_files:
  - split: train
    path: data/201402-*
- config_name: 201403-moves
  data_files:
  - split: train
    path: data/201403-*
- config_name: 201404-moves
  data_files:
  - split: train
    path: data/201404-*
- config_name: 201405-moves
  data_files:
  - split: train
    path: data/201405-*
- config_name: 201406-moves
  data_files:
  - split: train
    path: data/201406-*
- config_name: 201407-moves
  data_files:
  - split: train
    path: data/201407-*
- config_name: 201408-moves
  data_files:
  - split: train
    path: data/201408-*
- config_name: 201409-headers
  data_files:
  - split: train
    path: headers/201409/train-*
- config_name: 201409-moves
  data_files:
  - split: train
    path: data/201409-*
- config_name: 201410-moves
  data_files:
  - split: train
    path: data/201410-*
- config_name: 201411-moves
  data_files:
  - split: train
    path: data/201411-*
- config_name: 201412-moves
  data_files:
  - split: train
    path: data/201412-*
- config_name: 201501-moves
  data_files:
  - split: train
    path: data/201501-*
- config_name: 201502-moves
  data_files:
  - split: train
    path: data/201502-*
- config_name: 201503-moves
  data_files:
  - split: train
    path: data/201503-*
- config_name: 201504-moves
  data_files:
  - split: train
    path: data/201504-*
- config_name: 201505-moves
  data_files:
  - split: train
    path: data/201505-*
- config_name: 201506-moves
  data_files:
  - split: train
    path: data/201506-*
- config_name: 201507-moves
  data_files:
  - split: train
    path: data/201507-*
- config_name: 201508-moves
  data_files:
  - split: train
    path: data/201508-*
- config_name: 201509-moves
  data_files:
  - split: train
    path: data/201509-*
- config_name: 201510-moves
  data_files:
  - split: train
    path: data/201510-*
- config_name: 201511-moves
  data_files:
  - split: train
    path: data/201511-*
- config_name: 201512-moves
  data_files:
  - split: train
    path: data/201512-*
- config_name: 201601-moves
  data_files:
  - split: train
    path: data/201601-*
- config_name: 201602-moves
  data_files:
  - split: train
    path: data/201602-*
- config_name: 201603-moves
  data_files:
  - split: train
    path: data/201603-*
- config_name: 201604-moves
  data_files:
  - split: train
    path: data/201604-*
- config_name: 201605-moves
  data_files:
  - split: train
    path: data/201605-*
- config_name: 201606-moves
  data_files:
  - split: train
    path: data/201606-*
- config_name: 201607-moves
  data_files:
  - split: train
    path: data/201607-*
- config_name: 201608-moves
  data_files:
  - split: train
    path: data/201608-*
- config_name: 201609-moves
  data_files:
  - split: train
    path: data/201609-*
- config_name: 201610-moves
  data_files:
  - split: train
    path: data/201610-*
- config_name: 201611-moves
  data_files:
  - split: train
    path: data/201611-*
- config_name: 201612-moves
  data_files:
  - split: train
    path: data/201612-*
- config_name: 201701-moves
  data_files:
  - split: train
    path: data/201701-*
- config_name: 201702-moves
  data_files:
  - split: train
    path: data/201702-*
- config_name: 201703-moves
  data_files:
  - split: train
    path: data/201703-*
- config_name: 201704-moves
  data_files:
  - split: train
    path: data/201704-*
- config_name: 201705-moves
  data_files:
  - split: train
    path: data/201705-*
- config_name: 201706-moves
  data_files:
  - split: train
    path: data/201706-*
- config_name: 201707-moves
  data_files:
  - split: train
    path: data/201707-*
- config_name: 201708-moves
  data_files:
  - split: train
    path: data/201708-*
- config_name: 201709-moves
  data_files:
  - split: train
    path: data/201709-*
- config_name: 201710-moves
  data_files:
  - split: train
    path: data/201710-*
- config_name: 201711-moves
  data_files:
  - split: train
    path: data/201711-*
- config_name: 201712-moves
  data_files:
  - split: train
    path: data/201712-*
- config_name: 201801-moves
  data_files:
  - split: train
    path: data/201801-*
- config_name: 201802-moves
  data_files:
  - split: train
    path: data/201802-*
- config_name: 201803-moves
  data_files:
  - split: train
    path: data/201803-*
- config_name: 201804-moves
  data_files:
  - split: train
    path: data/201804-*
- config_name: 201805-moves
  data_files:
  - split: train
    path: data/201805-*
- config_name: 201806-moves
  data_files:
  - split: train
    path: data/201806-*
- config_name: 201807-moves
  data_files:
  - split: train
    path: data/201807-*
- config_name: 201808-moves
  data_files:
  - split: train
    path: data/201808-*
- config_name: 201809-moves
  data_files:
  - split: train
    path: data/201809-*
- config_name: 201810-moves
  data_files:
  - split: train
    path: data/201810-*
- config_name: 201811-moves
  data_files:
  - split: train
    path: data/201811-*
- config_name: 201812-moves
  data_files:
  - split: train
    path: data/201812-*
- config_name: 201901-moves
  data_files:
  - split: train
    path: data/201901-*
- config_name: 201902-moves
  data_files:
  - split: train
    path: data/201902-*
- config_name: 201903-moves
  data_files:
  - split: train
    path: data/201903-*
- config_name: 201904-moves
  data_files:
  - split: train
    path: data/201904-*
- config_name: 201905-moves
  data_files:
  - split: train
    path: data/201905-*
- config_name: 201906-moves
  data_files:
  - split: train
    path: data/201906-*
- config_name: 201907-moves
  data_files:
  - split: train
    path: data/201907-*
- config_name: 201908-moves
  data_files:
  - split: train
    path: data/201908-*
- config_name: 201909-moves
  data_files:
  - split: train
    path: data/201909-*
- config_name: 201910-moves
  data_files:
  - split: train
    path: data/201910-*
- config_name: 201911-moves
  data_files:
  - split: train
    path: data/201911-*
- config_name: 201912-moves
  data_files:
  - split: train
    path: data/201912-*
- config_name: 202001-moves
  data_files:
  - split: train
    path: data/202001-*
- config_name: 202002-moves
  data_files:
  - split: train
    path: data/202002-*
- config_name: 202003-moves
  data_files:
  - split: train
    path: data/202003-*
- config_name: 202004-moves
  data_files:
  - split: train
    path: data/202004-*
- config_name: 202005-moves
  data_files:
  - split: train
    path: data/202005-*
- config_name: 202006-moves
  data_files:
  - split: train
    path: data/202006-*
- config_name: 202007-moves
  data_files:
  - split: train
    path: data/202007-*
- config_name: 202008-moves
  data_files:
  - split: train
    path: data/202008-*
- config_name: 202009-moves
  data_files:
  - split: train
    path: data/202009-*
- config_name: 202010-moves
  data_files:
  - split: train
    path: data/202010-*
- config_name: 202011-moves
  data_files:
  - split: train
    path: data/202011-*
- config_name: 202012-moves
  data_files:
  - split: train
    path: data/202012-*
- config_name: 202101-moves
  data_files:
  - split: train
    path: data/202101-*
- config_name: 202102-moves
  data_files:
  - split: train
    path: data/202102-*
- config_name: 202103-moves
  data_files:
  - split: train
    path: data/202103-*
- config_name: 202104-moves
  data_files:
  - split: train
    path: data/202104-*
- config_name: 202105-moves
  data_files:
  - split: train
    path: data/202105-*
- config_name: 202106-moves
  data_files:
  - split: train
    path: data/202106-*
- config_name: 202107-moves
  data_files:
  - split: train
    path: data/202107-*
- config_name: 202108-moves
  data_files:
  - split: train
    path: data/202108-*
- config_name: 202109-moves
  data_files:
  - split: train
    path: data/202109-*
- config_name: 202110-moves
  data_files:
  - split: train
    path: data/202110-*
- config_name: 202111-moves
  data_files:
  - split: train
    path: data/202111-*
- config_name: 202112-moves
  data_files:
  - split: train
    path: data/202112-*
- config_name: 202201-moves
  data_files:
  - split: train
    path: data/202201-*
- config_name: 202202-moves
  data_files:
  - split: train
    path: data/202202-*
- config_name: 202203-moves
  data_files:
  - split: train
    path: data/202203-*
- config_name: 202204-moves
  data_files:
  - split: train
    path: data/202204-*
- config_name: 202205-moves
  data_files:
  - split: train
    path: data/202205-*
- config_name: 202206-moves
  data_files:
  - split: train
    path: data/202206-*
- config_name: 202207-moves
  data_files:
  - split: train
    path: data/202207-*
- config_name: 202208-moves
  data_files:
  - split: train
    path: data/202208-*
- config_name: 202209-moves
  data_files:
  - split: train
    path: data/202209-*
- config_name: 202210-moves
  data_files:
  - split: train
    path: data/202210-*
- config_name: 202211-moves
  data_files:
  - split: train
    path: data/202211-*
- config_name: 202212-moves
  data_files:
  - split: train
    path: data/202212-*
- config_name: 202301-moves
  data_files:
  - split: train
    path: data/202301-*
- config_name: 202302-moves
  data_files:
  - split: train
    path: data/202302-*
- config_name: 202303-moves
  data_files:
  - split: train
    path: data/202303-*
- config_name: 202304-moves
  data_files:
  - split: train
    path: data/202304-*
- config_name: 202305-moves
  data_files:
  - split: train
    path: data/202305-*
- config_name: 202306-moves
  data_files:
  - split: train
    path: data/202306-*
- config_name: 202307-moves
  data_files:
  - split: train
    path: data/202307-*
- config_name: 202308-moves
  data_files:
  - split: train
    path: data/202308-*
- config_name: 202309-moves
  data_files:
  - split: train
    path: data/202309-*
- config_name: 202310-moves
  data_files:
  - split: train
    path: data/202310-*
- config_name: 202311-moves
  data_files:
  - split: train
    path: data/202311-*
- config_name: 202312-moves
  data_files:
  - split: train
    path: data/202312-*
- config_name: 202401-moves
  data_files:
  - split: train
    path: data/202401-*
- config_name: 202402-moves
  data_files:
  - split: train
    path: data/202402-*
example:
  moves:
    site: xxxxxxx
    transcript: e2e4 e7e5 g1f3 b8c6
  headers:
    event: Rated Blitz game
    site: xxxxxxx
    white: player1
    black: player2
    result: 1-0
    utcdate: '2023-05-21'
    utctime: '13:45:00'
    whiteelo: 1500
    blackelo: 1400
    whiteratingdiff: 10
    blackratingdiff: -10
    eco: C50
    opening: Italian Game
    timecontrol: 300+0
    termination: Normal
---

# Dataset Card for Lichess.org Database in UCI format

## Table of Contents
- [Table of Contents](#table-of-contents)
- [Dataset Description](#dataset-description)
  - [Dataset Summary](#dataset-summary)
  - [Supported Tasks and Leaderboards](#supported-tasks-and-leaderboards)
- [Dataset Structure](#dataset-structure)
  - [Data Instances](#data-instances)
  - [Data Fields](#data-fields)
  - [Data Splits](#data-splits)
- [Dataset Creation](#dataset-creation)
  - [Curation Rationale](#curation-rationale)
  - [Source Data](#source-data)
  - [Annotations](#annotations)
  - [Personal and Sensitive Information](#personal-and-sensitive-information)
- [Considerations for Using the Data](#considerations-for-using-the-data)
  - [Social Impact of Dataset](#social-impact-of-dataset)
  - [Discussion of Biases](#discussion-of-biases)
  - [Other Known Limitations](#other-known-limitations)
- [Additional Information](#additional-information)
  - [Dataset Curators](#dataset-curators)
  - [Licensing Information](#licensing-information)
  - [Citation Information](#citation-information)
  - [Contributions](#contributions)

## Dataset Description
<!-- 
- **Homepage:** [Lichess.org Database](https://database.lichess.org/)
- **Repository:** [GitHub Repository](https://github.com/lichess-org/database)
- **Paper:** N/A
- **Leaderboard:** N/A
- **Point of Contact:** [Contact Lichess](https://lichess.org/contact) -->

### Dataset Summary

The Lichess.org database has been converted to UCI format, making it easier to analyze and interpret chess games. 
The `moves` configuration captures the sequence of moves using UCI notation, and the `headers` configuration provides 
comprehensive metadata for each game, enabling detailed statistical and strategic analysis. The data is subset based on 
the year and month (yyyymm format) the games took place.

### Supported Tasks and Leaderboards

This dataset supports tasks related to chess game analysis, including move prediction, game outcome prediction, performance 
analysis, and opening strategy evaluation. There are no formal leaderboards associated with this dataset.

## Dataset Structure

### Data Instances

An example from the `moves` configuration:
```json
{
  "site": "abcd1234",
  "transcript": "e2e4 e7e5 g1f3 b8c6"
}
```

An example from the `headers` configuration:
```json
{
  "event": "Rated Blitz game",
  "site": "abcd1234",
  "white": "player1",
  "black": "player2",
  "result": "1-0",
  "utcdate": "2023-05-21",
  "utctime": "13:45:00",
  "whiteelo": 1500,
  "blackelo": 1400,
  "whiteratingdiff": 10,
  "blackratingdiff": -10,
  "eco": "C50",
  "opening": "Italian Game",
  "timecontrol": "300+0",
  "termination": "Normal"
}
```

### Data Fields

#### Moves Configuration:
- `site`: string, unique identifier for the game. Replays can be viewed by navigating to `https://lichess.org/<site>`
- `transcript`: string, sequence of moves in UCI format.

#### Headers Configuration:
- `event`: string, type of event.
- `site`: string, unique identifier for the game.
- `white`: string, white player.
- `black`: string, black player.
- `result`: string, game result.
- `utcdate`: date32, date of the game.
- `utctime`: time64[us], time of the game.
- `whiteelo`: int64, ELO rating of the white player.
- `blackelo`: int64, ELO rating of the black player.
- `whiteratingdiff`: float64, rating change for the white player.
- `blackratingdiff`: float64, rating change for the black player.
- `eco`: string, ECO code of the opening.
- `opening`: string, name of the opening.
- `timecontrol`: string, time control format.
- `termination`: string, reason for game termination.

### Data Splits

The dataset is divided into monthly splits based on the year and month (yyyymm format). Each split contains both `moves` and `headers` configurations.

## Dataset Creation

### Curation Rationale

The dataset was curated to facilitate research and analysis that use chess games, providing both move sequences and comprehensive metadata. 

### Source Data

#### Initial Data Collection and Normalization

The data was collected from the Lichess.org open database, converted from PGN format to UCI format, and organized into `moves` and `headers` configurations.

#### Who are the source data producers?

The source data comes from games played on Lichess.org, an online platform where users from around the world play chess.
This database does not distinguish between human-and bot-played games. 
However, it's reasonable to assume games played before April 2018 were overwhelmingly played by human players since Lichess.org 
released its [bot api](https://github.com/lichess-org/api) on April 1st, 2018.

### Annotations

#### Annotation process

The annotations include metadata such as player ELO ratings, game outcomes, and dates, which were extracted from the original 
PGN files and normalized into a structured format.

#### Who are the annotators?

The annotations were generated by the Lichess.org platform and curated by the dataset creators.

### Personal and Sensitive Information

The dataset does not contain any personal or sensitive information.

## Considerations for Using the Data

### Social Impact of Dataset

The dataset can be used to improve chess engines, develop training tools for players, and conduct research in game theory and artificial intelligence.

### Discussion of Biases

The dataset may have biases related to the demographics of Lichess.org users, such as skill level distribution and regional representation.

### Other Known Limitations

The dataset is limited to games played on Lichess.org and may not represent the broader chess-playing population.

## Additional Information

### Dataset Curators

The dataset was curated by the Lichess.org team and contributors.

### Licensing Information

The dataset is available under the Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

### Citation Information

If you use this dataset, please cite it as follows:

```
@misc{lichess_uci,
  author = {Davis, Austin L.},
  title = {Lichess.org Database in UCI format},
  year = {2023},
  howpublished = {\url{https://database.lichess.org/}},
}
```

### Contributions

Thanks to [@austinleedavis](https://github.com/austinleedavis) for adding this dataset.