[Event "Varna 1970"]
[Site "Varna BUL"]
[Date "1970.06.??"]
[EventDate "1970.06.00"]
[Round "4"]
[Result "1/2-1/2"]
[White "Atanas Kolarov"]
[Black "Hristo Gerenski"]
[ECO "E98"]
[WhiteElo "?"]
[BlackElo "?"]
[Source "Perpetual Check"]
[PlyCount "84"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5
Ne7 9. Ne1 Nd7 10. Nd3 f5 11. Bd2 Nf6 12. f3 f4 13. c5 g5 14. Rc1 Ng6 15. cxd6
cxd6 16. Nf2 Rf7 17. Nb5 Ne8 18. a4 Bf8 19. Rc3 h5 20. Qc2 a6 21. Na3 Bd7 22.
b4 Nf6 23. h3 Rg7 24. Rc1 Nh4 25. Qd1 Qe8 26. b5 Qg6 27. Rc7 Rb8 28. Be1 Be7
29. Nc4 g4 30. hxg4 hxg4 31. fxg4 Bd8 32. b6 Ne8 33. Bb4 Bxc7 34. bxc7 Rc8 35.
Ba5 b5 36. Na3 Rf7 37. axb5 axb5 38. Bxb5 Bxb5 39. Nxb5 Qg5 40. Na7 Rcxc7 41.
Bxc7 Nxc7 42. Rc6 1/2-1/2