[Event "Montreal"] [Site "?"] [Round "0"] [White "Tal"] [Black "Larsen"] [Result "1-0"] [ECO "B33"] [Opening "Sicilian: Open, 2...Nc6"] 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 Be7 8. O-O-O a6 9. f4 Qc7 {This is too slow. White's space edge allows him to prepare simultaneously for an attack either in the center or on the kingside, so Black should go straight for counterplay by 9...Bd7 and 10...b5.} 10. Be2 Nxd4 { 10...O-O 11.Bf3 Bd7 12.Rhe1 White has a bind and Black doesn't have any comfortable defence to the threat of 13.e5.} 11. Qxd4 b5 12. e5 dxe5 13. fxe5 Nd5 {Black has lost too much time and can no longer play normal moves. 13... Nd7 14.Bxe7 Kxe7 15.Qh4+ Ke8 16.Ne4 White has a huge bind.} 14. Bxe7 Nxc3 { The first of several zwischenzugs by both sides. Black prevents White from winning a pawn on d5 before recapturing the bishop. 14... Nxe7 15.Nxb5 axb5 16. Bxb5+ Black is getting mated on d8 in two moves.} 15. Bf3 {Black missed this zwischenzug which keeps the initiative for White. Now Black's best chance would be 15...Ne2+, forcing White's bishop to retreat.} 15... Nxd1 16. Bd6 Qc4 17. Qb6 {Another intermediate move, which maintains all the threats and brings the queen a perfect attacking square.} 17... Nf2 { Black tries one last intermediate move, hoping for:} 18. Bc6+ { 18.Qxf2 Qf4+ 19.Kb1 Bd7 when White's bishop is pinned onto his queen.} 18... Bd7 19. Bxd7+ Kxd7 20. Qb7+ Kd8 21. Qxa8+ Qc8 22. Qa7 { The final tactic: White threatens both mate on e7 and the knight on f2.} 1-0