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README.md
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# Dataset Card for Lichess Puzzles
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<!-- Provide a quick summary of the dataset. -->
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4,062,423 chess puzzles, rated and tagged. See them in action on [Lichess](https://lichess.org/training/themes).
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Generating these chess puzzles took more than **50 years of CPU time**. We went through **300,000,000 analyzed games** from the Lichess database, and re-analyzed interesting positions with Stockfish 12/13/14/15 NNUE at 40 meganodes. The resulting puzzles were then [automatically tagged](https://github.com/ornicar/lichess-puzzler/tree/master/tagger). To determine the rating, each attempt to solve is considered as a Glicko-2 rated game between the player and the puzzle. Finally, player votes refine the tags and define popularity.
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# Dataset Card for Lichess Puzzles
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<!-- Provide a quick summary of the dataset. -->
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## Dataset Description
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4,062,423 chess puzzles, rated and tagged. See them in action on [Lichess](https://lichess.org/training/themes).
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### Dataset Creation
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Generating these chess puzzles took more than **50 years of CPU time**. We went through **300,000,000 analyzed games** from the Lichess database, and re-analyzed interesting positions with Stockfish 12/13/14/15 NNUE at 40 meganodes. The resulting puzzles were then [automatically tagged](https://github.com/ornicar/lichess-puzzler/tree/master/tagger). To determine the rating, each attempt to solve is considered as a Glicko-2 rated game between the player and the puzzle. Finally, player votes refine the tags and define popularity.
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