Omaha is a variant of Texas Hold'em Poker. Omaha is considered, by some, to be the hardest game of Poker to master. Of all of the different games of Poker, Omaha is for many the hardest to learn to play and the hardest to bluff in. It is played most often at fixed limits, like Texas Hold'em and pot limit.
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.