[Event "URS-ch31 Final"]
[Site "Leningrad"]
[Date "1963.11.??"]
[Round "4"]
[White "Klovans, Janis"]
[Black "Kortschnoj, Viktor Lvovich"]
[Result "1/2-1/2"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Nb8 10. d4 Nbd7 11. c4 c6 12. c5 Qc7 13. cxd6 Bxd6 14. Nc3 exd4 15. Nxd4 Nc5 16. Qf3 Be5 17. Nf5 Nxb3 18. axb3 Be6 19. Bg5 Bxb3 20. Qe3 Qa7 21. Qxa7 Rxa7 22. Be3 Rd7 23. Rxa6 b4 24. Na4 Bxa4 25. Rxa4 Bxb2 26. Bc5 Re8 1/2-1/2