Piatigorsky Cup 2nd
 
Santa Monica / 1966
 
Black: Petrosian, Tigran V
 

 
White: Ivkov, Borislav

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E19: Queen's Indian, Old Main line, 9.Qxc3
 

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3 Ne4 8. Qc2 Nxc3 9. Qxc3 d6 10. Qc2 f5 11. Ne1 Bxg2 12. Nxg2 Qd7 13. b3 Nc6 14. Bb2 e5 15. dxe5 dxe5 16. Rad1 Qe6 17. Ne3 Rf7 18. Nd5 Bc5 19. a3 a5 20. Kg2 Re8 21. f3 Nd4 22. Bxd4 exd4 23. b4 axb4 24. axb4 Qxe2+ 25. Rf2 Qxc2 26. Rxc2 Bf8 27. Rxd4 c5 28. bxc5 Bxc5 29. Rd1 Ra7 30. Rb2 (Draw)