[Event "USSR vs. Yugoslavia"] [Site "?"] [Round "0"] [White "Petrosian"] [Black "Matanovic"] [Result "1-0"] [ECO "E41"] [Opening "Nimzo-Indian: 4.e3 c5 5.Nf3"] 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Nf3 O-O 6. Be2 b6 7. O-O Bb7 8. Na4 cxd4 9. exd4 Qc7 {Black overestimates his chances. His first concern should have been for the safety of his dark squared bishop. 9...Be7 Followed by pawn d5 was better.} 10. c5 bxc5 11. a3 Ba5 12. dxc5 Ng4 { This was the trick Black had in mind when playing 9...Qc7.} 13. h3 Bxf3 14. hxg4 Bxe2 15. Qxe2 Qc6 16. b3 Bc7 17. Rd1 Na6 { White stands much better due to his hold on the open files and central squares. } 18. Be3 f5 19. gxf5 Rxf5 20. Rac1 Be5 {20...Raf8} 21. f4 Bc7 { 21...Bxf4 22.Bxf4 Rxf4 23.Rd6 Qb7 24.Rxa6 leaves White up a piece.} 22. Nb6 { A surprising blow which quickly ends the game.} 22... axb6 23. cxb6 Qb7 24. Rxd7 {White wins material because of the pin on the bishop.} 24... Rf7 25. Rxf7 Kxf7 26. bxc7 Rc8 {26...Nxc7 27.Qh5+ Kg8 28.Qe5 Rc8 29.Bd4 Ne8 30.Qxe6+} 27. Qh5+ Kf8 28. Rd1 Qxc7 29. Qxh7 Qc3 30. Bd4 { Black resigned in view of the double attack on g7.} 1-0