[Event "Moscow"] [Site "?"] [Round "0"] [White "Spassky"] [Black "Korchnoi"] [Result "1-0"] [ECO "E15"] [Opening "Queen's Indian: 4.g3 Bb7"] 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3 {This is th e normal starting position of the Classical lines of the Queen's Indian Defense. Usually Black plays 7...Ne4 here, after which the knight can be supported by an advance of the f-pawn.} 7... d5 {This move has always had a bad reputation because the pawn at d5 becomes a target and White can unleash the power of the bishop at g2 by playing Ne5.} 8. cxd5 exd5 9. Ne5 { White's forces are better placed.} 9... Qc8 { The idea is to defend the bishop at b7.} 10. Bg5 Qe6 {Now the queen guards the minor pieces on the kingside. But Her Majesty is ill-suited to the role of a chaperone!} 11. Rc1 c5 {Black takes advantage of the fact that the pawn on d4 must remain in place to guard the knight at e5. But White has a very powerful reply.} 12. Nd3 {The knight threatens a fork at f4, attacking pieces at d5 and e6. Right now it doesn't seem so dangerous, but Spassky will quickly eliminate the support of that square.} 12... cxd4 13. Bxf6 Bxf6 { Now White has a combination which wins the game.} 14. Nxd5 { The threats are Nc7 and Nxf6+, so Black must capture.} 14... Bxd5 15. Nf4 { This fork is the heart of the combination.} 15... Qd6 16. Nxd5 { There are still tremendous threats at c7 and f6!} 16... Bg5 { 16...Bd8 17.Nf4 Nc6 18.Rxc6} 17. f4 Bd8 18. Nc3 { This is made possible by the fact that the pawn at d4 is pinned.} 18... Na6 { 18...Qc5 19.Na4} 19. Bxa8 {The rest is easy.} 19... Qb8 20. Nd5 Qxa8 21. Qxd4 Nc5 22. b4 Ne6 23. Qd3 Re8 24. e4 1-0