[Event "URS-ch37 Final"]
[Site "Moscow"]
[Date "1969.10.05"]
[Round "20"]
[White "Petrosian, Tigran V"]
[Black "Averkin, Orest Nikolaevich"]
[Result "1/2-1/2"]
1. d4 Nf6 2. Nf3 b6 3. Bg5 Bb7 4. Nbd2 c5 5. e3 e6 6. Bd3 Be7 7. c3 Nc6 8. O-O O-O 9. Re1 d5 10. a3 Qc7 11. Qb1 h6 12. Bh4 Rfd8 13. b4 a6 14. Ra2 cxb4 15. cxb4 Rdc8 16. Rc1 Qd8 17. Rac2 Na7 18. Ne5 Rxc2 19. Rxc2 Rc8 20. f3 Rxc2 21. Qxc2 Qc8 22. Qxc8+ Nxc8 23. Nb3 Kf8 24. Be1 a5 25. Kf2 axb4 26. Bxb4 Bxb4 27. axb4 Ke7 28. Nc1 Ne8 29. Na2 Nc7 30. Nc3 1/2-1/2