Champion Ties Series
Down two points and with his back to the wall, world champion Tigran Petrosian, has surprised the chess world by winning the 10th and 11th games, and drawing the 12th to even the count against challenger Boris Spassky, 6-6 pts. This is the halfway point in the best of 24 games match. There is still a long way to go, but the champion again has a psychological advantage as he needs only 12 pts. to draw the match and retain the title, whereas, Spassky, as challenger must score 12½ pts. to win.
In the 8th game, the champion made a serious slip which cost him the 'exchange'. Spassky gave it back eventually to launch an attack on the K-side.
Tigran V Petrosian vs Boris Spassky
Petrosian - Spassky World Championship Match (1969), Moscow URS, rd 8, May-02
Queen's Gambit Declined: Harrwitz Attack (D37) 0-1
1. c4 e6 2. d4 d5 3. Nc3 Be7 4. Nf3 Nf6 5. Bf4 c5 6. dxc5 Na6 7. e3 Nxc5 8. cxd5 exd5 9. Be2 O-O 10. O-O Be6 11. Be5 Rc8 12. Rc1 a6 13. h3 b5 14. Bd3 d4 15. Bxd4 Nxd3 16. Qxd3 Bc4 17. Qb1 Bxf1 18. Rxf1 Nd5 19. Ne2 Bf6 20. Rd1 Qc7 21. Bxf6 Nxf6 22. Nfd4 Qe5 23. Qd3 Rfd8 24. a4 bxa4 25. Ra1 Ne4 26. Qxa6 Ra8 27. Qd3 Re8 28. Nf4 g6 29. Qa3 Qf6 30. Nd3 Rec8 31. Rd1 Rc4 32. b4 Rac8 33. b5 Rc3 34. Qa1(a) Rxd3 35. Rxd3 Qxf2+ 36. Kh2 Qg3+ 37. Kg1 Qf2+ 38. Kh2 Qg3+ 39. Kg1 Nf2 40. Nc6 Nxh3+ 41. Kh1 Nf2+ 42. Kg1 Nxd3 43. Ne7+ Kf8 44. Nxc8 Qxe3+
(a) If 34. QxRP RxN; 35. RxR QxBPch; 36. K-R2 Q-N6ch; 37. K-N1 R-B8ch; 38. R-Q1 QxKPch; 39. K-R2 Q-B5ch; 40. K-N1 N-B6; 41. Q-R8ch K-N2; 42. RxR QxRch; 43. K-B2 Q-Q7ch; and QxN. Or 43. K-R2 Q-B5ch and QxN. Spassky takes another line in the sequel.