Biography. Simon Mattsson is a Swedish poker player and former online world number one having held the title on at least eight separate occasions. He is best known for playing online under the username 'C. Darwin2'.

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.