I found an article about scrabble (http://lifehacker.com/5868095/hacking-scrabble-part-one) and started wondering what games you could benefit from having a good memory. Maybe this should be several threads (one per game) but could we discuss some possible usages of memory to become better at games? This is a great way to practice your memory while having fun.
So one obvious game is chess. Even though you don't have much advantage memorizing chess openings when you are a beginner (or so I've been told) I would like to see a tree with the most common opening moves, and their responses. Once you have memorized a part of the tree you could add branches and increase the tree depth. If people could memorize 80,000 decimals of PI it should be possible to memorize at least 1000 opening states with responses. I've read that the GMS method has something to say about how to get better at chess, but I can't find in what way.
Scrabble: you could, as the article above describes, memorize all 2-letter words, and words that contain high-value letters (in Swedish there are very few words that contain W,X,Y,Z so you could memorize them all).
Black jack: memorize the black-jack strategy for when to hit and when to hold.
Cards in general: if the game in some stage contains open cards you could memorize what player has what cards.
Trivia games: Find out what categories that are common (US presidents, capitals of the world) and memorize just as much as you have to.
Could you fill in with more games and methods?