The 4-2 Rule is a way to turn the number of drawing outs you have into your odds of hitting them. It's times 4 on the flop to hit on the turn or river, and times 2 on the turn to hit your draw on the river. Example: a flopped flush draw is 9 outs. Multiply this by 4, and the odds of hitting it by the river are 36%.
While it's possible to argue that a novice poker player may make a mistake at the table, that argument doesn't hold up if it involves an experienced poker pro. That was the excuse Brazilian poker player Rafael Caiaffa made during a recent tournament, but his antics have cost him an indefinite ban from the game.
