Alexander Alekhine
In the early 1930s Alekhine dominated tournament play, and won top-class tournaments by large margins. He also played first board for France in four Chess Olympiads, winning prizes in each. His tournament record became less good from the mid-1930s onwards; alcoholism is often blamed for this. Although Alekhine offered Capablanca a rematch on the same terms that Capablanca had set for him, negotiations dragged on for years. It became clear that Alekhine would never let the match take place. Meanwhile, he defended his title with ease against Bogolyubov in 1929 and 1934.