[Event "Varna Olympiad"] [Site "?"] [Round "0"] [White "Fischer"] [Black "Purevzhav"] [Result "1-0"] [ECO "B70"] [Opening "Sicilian: Dragon"] 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 Nc6 8. Qd2 O-O 9. Bc4 Nd7 {The slowest continuation accepted by theory. Black hopes to get play against White's queenside with his knights, but weakens his king position.} 10. O-O-O Nb6 11. Bb3 Na5 12. Qd3 {White doesn't want to allow either knight to move to c4, which would force him to give up his Be3. Black might then get strong play on the dark squares.} 12... Bd7 13. h4 Rc8 14. h5 { So White draws first blood. Once he takes on g6 he will be able to play Bh6, leaving Black's king naked to the wind.} 14... Nac4 15. hxg6 hxg6 {If 15...Nxe3 , White would not play 16.gxh7+, when his own pawn on h7 would keep the kingside closed, but 16.gxf7+ Kh8 17.Qxe3, when h7 is a target and White already threatens 18.Rxh7+ Kxh7 19.Rh1+.} 16. Bh6 e6 17. f4 { Threatening 18.Qh3, when Black will have no defense to mate on h7 or h8.} 17... e5 18. Nf5 {Renewing the threat of Qh3. If Black takes the knight he gets mated after 18...gxf5 19.Bxg7 Kxg7 20.Qg3+ Kf6 21.Qg5+ Ke6 22.ef.} 18... Bxf5 19. exf5 Nxb2 { A last desparate bid for counterplay, but Fischer has seen everything.} 20. Kxb2 e4 21. Bxg7 {Black may have missed this move. He can't take the queen because of 22.f6 and mate on h8.} 21... Kxg7 22. Nxe4 1-0