[Event "October Revolution 50years"]
[Site "Moscow"]
[Date "1967.06.06"]
[Round "11"]
[White "Portisch, Lajos"]
[Black "Bobotsov, Milko Georgiev"]
[Result "1/2-1/2"]
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. d5 Nbd7 8. Nd2 a5 9. Qc2 Nc5 10. Nb3 b6 11. Nxc5 bxc5 12. a4 Nd7 13. h4 Nb8 14. h5 Na6 15. Na2 f5 16. hxg6 hxg6 17. Qc3 f4 18. Bd2 Nb4 19. Nxb4 axb4 20. Qf3 Qe8 21. b3 Bd7 22. Rd1 g5 23. Qh5 Qxh5 24. Bxh5 Bf6 25. Ke2 Kg7 26. Kf3 Rh8 27. g3 Rh6 28. Bg4 Bxg4+ 29. Kxg4 Rxh1 30. Rxh1 Kg6 31. Ra1 Ra5 32. Ra2 Bg7 33. Bc1 Bf6 34. Bb2 Ra8 35. gxf4 exf4 36. Bc1 Bc3 37. a5 Ra6 38. Kf3 1/2-1/2