1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... d7d5 The Queen's Gambit is an essential guest at world championships, with memorable games in the legendary clashes between Capablanca vs. Alekhine, Spassky vs. Fischer, and Karpov vs. Kasparov, among others. 4. c4d5 The exchange variation was Kasparov's favorite. 4... e6d5  5. c1g5 