39th USSR Championship — Leningrad 1971ROUND 21
[Event "URS-ch39 Final"]
[Site "Leningrad"]
[Date "1971.10.16"]
[Round "21"]
[White "Polugaevsky, Lev"]
[Black "Karpov, Anatoly"]
[Result "1/2-1/2"]
1. c4 c5 2. Nf3 Nf6 3. Nc3 d5 4. cxd5 Nxd5 5. g3 g6 6. Bg2 Bg7 7. O-O O-O 8. Nxd5 Qxd5 9. d3 Na6 10. a3 Qh5 11. Rb1 Bh3 12. Qb3 b6 13. Qc4 Nc7 14. Bxh3 Qxh3 15. b4 Ne6 16. Be3 Rac8 17. Qa6 Nd4 18. Bxd4 cxd4 19. Qxa7 Qe6 20. Rfe1 Ra8 21. Qb7 Rxa3 22. Ng5 Qe5 23. Nf3 1/2-1/2