[Event "IBM"]
[Site "Amsterdam"]
[Date "1968.??.??"]
[Round "5"]
[White "Shamkovich, Leonid Alexandrovic"]
[Black "Ivkov, Borislav"]
[Result "1-0"]

1. Nf3 g6 2. e4 Bg7 3. d4 d6 4. Nc3 a6 5. a4 b6 6. Bg5 Bb7 7. Bc4 h6 8. Bh4 Nd7 9. O-O c6 10. Qe2 Qc7 11. Bb3 e6 12. Rad1 Ne7 13. Rfe1 Kf8 14. Bg3 Kg8 15. h4 Kh7 16. h5 Rhg8 17. hxg6+ Nxg6 18. Rd3 Rae8 19. Bh2 b5 20. Ng5+ hxg5 21. Qh5+ Bh6 22. Rh3 Nh4 23. Qxf7+ Kh8 24. Bxe6 Bc8 25. Rxh4 gxh4 26. Bf5 Nf6 27. Qxc7 Bxf5 28. Qxd6 Re6 29. Qc5 Bh3 30. Bg3 Bf8 31. Qa7 b4 32. gxh3 Re7 33. Qxa6 bxc3 34. bxc3 hxg3 35. f3 Nh5 36. Qxc6 Kh7 37. e5 Rf7 38. Qe4+ Kh6 39. e6 Rf4 40. Qe3 Be7 41. d5 Rd8 42. c4 Bg5 43. e7 Re8 44. Qe6+ Nf6 45. d6 Rd4 46. h4 Bxh4 47. Qe3+ 1-0