The primary reason for why Stu changed from gin to poker was that he was a bit too skilled at it. So skilled in fact, that no one possibly could stand up to him. Even the apparently professionals who were supposed to be the most favorable at gin were demolished when they faced Mr. Ungar. One such gin masters was Harry Stein, called, "Yonkie". Harry Stein suffered such a debilitating beating at the hands of stu that he apparently quit competing in it as a pro and never resurfaced at a gin rummy tournament.
Accordingly, with a reputation like that it was not very long before players became shy of gambling against mr. ungar. He couldn’t find any matches and in his bleakness he began doing something no one had done prior. Stu began offering starting handicaps to potential opposing players in the high hopes that they may play with him if they thought they held an edge. He deliberately started from a bad arrangement and one tale has it that he even competed with a regular cheater. During the match, he received warnings that the cheater was at it one more time but mr. ungar assured that he deduced of the fraudulent activity and he would still come away with a win, which he did, of course.
The same problem followed Stu Ungar into vegas. He won so often that the poker rooms started asking him not to compete in their rooms anymore. The basis for it was that other poker room clients refused to sit at the table if he were playing.
Stu Ungar is recollected more for his abilities in texas hold’em poker but he always said that he was much more skilled at gin rummy.
He beat Doyle Brunson in the WSOP in Nineteen Eighty to become the youngest world camp. Because of his features that made him appear far younger than he really was, he got the nickname, "The Kid".