 In 1926, he took 2nd, behind Kupchik, at New York (Quadrangular).In 1927, Jaffe sent a cable from New York to Alexander Alekhine in Buenos Aires, where Alekhine was playing José Raúl Capablanca in the World Championship match.The cable contained Jaffe's analysis of a new variation in the Queen's Gambit, which Alekhine is thought to have used in the match.