[Event "Zurich"] [Site "?"] [Round "0"] [White "Petrosian"] [Black "Schmid"] [Result "1-0"] [ECO "A43"] [Opening "Old Benoni: Schmidt"] 1. d4 c5 2. d5 d6 3. c4 g6 4. Nc3 Bg7 5. e4 Nf6 6. Be2 O-O 7. Nf3 e6 8. O-O exd5 9. cxd5 {The Modern Benoni is a very sharp opening, thanks to the precarious central formation.} 9... Re8 10. Nd2 Na6 11. f3 Nc7 12. a4 b6 13. Nc4 {Even though many moves have been played, both combatants are well-prepared, and had been studying these formations.} 13... Ba6 14. Bg5 Bxc4 15. Bxc4 a6 16. Kh1 { If the game opens up the king will be safer tucked away in the corner.} 16... Rb8 17. Qe2 Qc8 18. Bf4 Bf8 19. Rab1 Nh5 {19...b5 20.axb5 axb5 21.Nxb5 Nxb5 22. Bxb5 White would win a pawn and have an attack on the Black rook.} 20. Bd2 { White has developed his pieces for play on either wing, depending on what plan Black chooses.} 20... f5 21. g4 {Black will find his pieces lack coordination to defend against the direct kingside attack.} 21... Nf6 { 21...fxg4 22.fxg4 Ng7 23.Rf2 when Black would be defenceless on the f-file.} 22. gxf5 {The open g-file will be the key to White's success in this game.} 22... gxf5 23. Rg1+ Kh8 24. Rg3 {White prepares to double rooks on the g-file.} 24... Re7 25. Rbg1 Rg7 26. e5 {This central break allows all the White pieces to participate in the attack. While his counterparts can only watch on helplessly out of play.} 26... dxe5 27. Qxe5 Nce8 28. Rxg7 Bxg7 29. Rxg7 { White sacrifices the exchange which allows the White queen and bishops to weave a mating net.} 29... Kxg7 30. Qe7+ Kg6 31. d6 { Black resigned. 31.d6 Qb7 32.Qe3 when Black's king cannot escape.} 1-0