[Event "Midwest Masters op"]
[Site "Chicago"]
[Date "1987.??.??"]
[Round "4"]
[White "Blocker, Calvin"]
[Black "Sprenkle, David"]
[Result "1-0"]
[WhiteElo "2370"]
[BlackElo "2325"]

1. d4 f5 2. Nc3 Nf6 3. Bg5 e6 4. e4 fxe4 5. Nxe4 Be7 6. Bxf6 Bxf6 7. Nf3 d5 8. Nxf6+ Qxf6 9. Bd3 Nc6 10. Bb5 Bd7 11. Bxc6 Bxc6 12. O-O O-O 13. Re1 Be8 14. Qd2 Bg6 15. Ne5 Rad8 16. c3 Be4 17. Re2 h6 18. Rae1 g5 19. Re3 Qg7 20. f3 Bf5 21. Nd3 b6 22. g4 Bg6 23. Rxe6 Rxf3 24. Ne5 Rf6 25. Rxf6 Qxf6 26. Rf1 Qg7 27. Qf2 Be4 28. Qf6 Rf8 29. Qe6+ Kh7 30. Nd7 Rxf1+ 31. Kxf1 Kh8 32. Qe8+ Qg8 33. Qxg8+ Kxg8 34. Nf6+ Kf7 35. Nxe4 dxe4 36. Ke2 Ke6 37. c4 1-0