As a recreational poker player, he had previously entered only a few major tournaments, one of which was the 1994 World Series of Poker championship event, where he finished in 22nd place.
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Longson eventually won a WSOP bracelet in 1994 World Series of Poker in the $1,500 pot limit Omaha event, defeating a final table including Surinder Sunar and T.J. Cloutier.