A weak hand is easily corrected when the past mistakes are looked into. This is how Jerry Yang has been winning most of his games. It does not matter how much a poker player has prepared for a game, if he is unable to connect the past with his present, he may still lose. The reason for record keeping is simply to help poker players play better than they do. And if you are a new player who would want to make your entry in WSOP, you should read the hands of so many poker players.