# Memorizing a Deck of Cards

I just memorized a deck of cards, because I was told doing so [would improve my focus](https://www.lesswrong.com/posts/P3zrurj5hHKFKDL3M/productivity-working-towards-a-summary-of-what-we-know#Deliberately_train).

The process took 2 hours and 13 minutes, including breaks.  I used 20-5 pomodoro at first, and switched to 25-5 in the middle.

I initially wrote a script to simulate a randomly shuffled deck.  After memorizing the first 18 cards, I switched to a physical deck (starting with the same cards).

I chose not to use any strategy from an outside source (e.g. memory palace), because I wanted to see what I would come up with on my own, and I thought that using such a strategy might make the challenge too easy.

I began by memorizing cards in groups of four.  After memorizing a group, I would go back to the previous group and see if I still remembered all of the cards in both groups.  Then I would go back an arbitrarily far amount (wherever I cut the deck), and begin from there.  Occasionally, I would go back to the beginning and go through the deck up to the point I had memorized to.  If I messed up in an earlier group, I would repeat the process for that group.

However, after three such groups (12 cards), it became clear that four was too many to memorize at once, so I switched to groups of three.  I then ran into another problem-I could memorize individual groups fairly easily, but I would have trouble remembering the order in which the groups themselves came.  I was able to solve this problem by “linking” the groups together - memorizing the last card of the previous group along with the next group.

A few attributes of groups made them easier to memorize:
* two or more cards in the group share a face or suit
    * fortunately, this is true for most groups
* the group is monotonically increasing or decreasing
* two consecutive cards in the group numbers which are related to one another 
    * one is a factor of the other (e.g. 3 and 9),
    * they are consecutive (e.g. 10 and jack)

The easiest group was 4 of spades, 7 of spades, 8 of spades - increasing and all of the same suit.

Some of my most common mistakes were:
* mixing up suits of the same color
* getting the order of the groups wrong
* mixing up aces and queens

Sometime into the task, I grew anxious that I was wasting my time, or that it wouldn’t help, or that I should be working on something else.  There were times when I felt an urge to stop and do anything else.  I often get such urges when doing other activities, but this time I was able to resist them.  I think that this might be because there was also a clear next step in this task, and because I knew that the point of the task was to train my focus.

About three hours after my first success, I went through the deck again, with no practice in between.  I only got three of the cards wrong, though I frequently had to think for a while.

Did this activity improve my focus? I suppose we’ll have to wait and see.  I was able to write this post, which isn’t something I would normally have the willpower to do, but that may have been me riding on the high of memorizing the deck (It felt so satisfying when I finally memorized the whole thing).  Maybe I’ll post an update next week.