A Fifty50 Tournament is different to a double or nothing tournament.
This tournament also starts and runs like a normal tournament but when 50% of the players have been eliminated then the tournament stops. The prize pool is then divided among the remaining players. The prize pool is divided according to chip stack. For example, if the tournament stopped after 50% of the eliminations and a player had 10% of the chips in play, then he would receive 10% of the prize pool.