 In 1904, he took 7th out of 10 players at the St. Louis (7th American Congress) with 5/11, as Frank James Marshall won.Jaffe defeated Jacques Mieses, a leading player, by 2-0 in a mini-match at New York 1907.In 1909, Jaffe took 3rd out of 6 players with 3/5 in a small tournament at Bath Beach, Brooklyn NY (Herbert Rosenfeld won).