In 1927, Alekhine's challenge to Capablanca was backed by a group of Argentine businessmen and the president of Argentina, who guaranteed the funds, and organized by the Club Argentino de Ajedrez (Argentine Chess Club) in Buenos Aires. In the World Chess Championship match played from September to November 1927 at Buenos Aires, Alekhine won the title, scoring +6−3=25. This was the longest formal World Championship match until the contest in 1984 between Anatoly Karpov and Garry Kasparov. Alekhine's victory surprised almost the entire chess world, since he had never previously won a single game from Capablanca. After Capablanca's death Alekhine expressed surprise at his own victory, since in 1927 he did not think he was superior to Capablanca, and he suggested that Capablanca had been overconfident. Capablanca entered the match with no technical or physical preparation, while Alekhine got himself into good physical condition and had thoroughly studied Capablanca's play. According to Kasparov, Alekhine's research uncovered many small inaccuracies, which occurred because Capablanca was unwilling to concentrate intensely. Vladimir Kramnik has commented that this was the first contest in which Capablanca had no easy wins.