Capablanca won the London tournament of 1922 with 13 points in 15 games with no losses, ahead of Alekhine with 11½, Milan Vidmar (11), and Akiba Rubinstein (10½). During this event, Capablanca proposed the "London Rules" to regulate future World Championship negotiations: the first player to win six games would win the match; playing sessions would be limited to 5 hours; the time limit would be 40 moves in 2½ hours; the champion must defend his title within one year of receiving a challenge from a recognized master; the champion would decide the date of the match; the champion was not obliged to accept a challenge for a purse of less than US$10,000 (about $260,000 in 2006 terms); 20% of the purse was to be paid to the title holder and the remainder divided, 60% to the winner of the match, and 40% to the loser; the highest purse bid must be accepted. Alekhine, Efim Bogoljubow, Géza Maróczy, Richard Réti, Rubinstein, Tartakower and Vidmar promptly signed them. Between 1921 and 1923 Alekhine, Rubinstein and Nimzowitsch all challenged Capablanca, but only Alekhine could raise the money, in 1927.