Oscar Chajes was born in Brody, Galacia, Austria-Hungary (what is now Ukraine) on December 14, 1873. In 1909 he was the winner of the U.S. Open in Excelsior, Minnesota. He became secretary of the Isaac L. Rice Progressive Chess Club. In 1911, he took last place at Carlsbad. In 1916 he defeated Capablanca in New York (round 2) in 66 moves at the Rice Memorial tournament. Chajes took 3rd place, after Capablanca and Janowski. Capablanca would not lose another game until the 1924 New York tournament, where he lost to Richard Reti. In 1917 Chajes won the New York State championship in Rochester. He tied for 1st in the 1919-1920 Manhattan Chess club championship with Abraham Kupchik. He won the 1923-24 Manhattan CC championship. He died on February 28, 1928.