[Event "Wageningen"] [Site "?"] [Round "0"] [White "Donner"] [Black "Larsen"] [Result "1-0"] [ECO "E60"] [Opening "King's Indian: 3.g3"] {The a1-h8 Diagonal} 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nc3 d6 6. Nf3 Nc6 7. O-O a6 8. d5 Na5 9. Nd2 c5 10. Qc2 Rb8 11. b3 b5 12. cxb5 axb5 13. Bb2 b4 14. Nd1 Ba6 15. Re1 Bh6 16. e4 Bxd2 17. Qxd2 c4 18. e5 $1 {White makes good use of the a1-h8 diagonal, which has been seriously weakened by the exchange of Black's dark-square Bishop} 18... Ne8 (18... c3 19. Nxc3 bxc3 20. Bxc3 { Black recovers his piece with advantage}) 19. Qd4 $1 c3 (19... dxe5 20. Qxe5 f6 (20... Nf6 21. d6 {overworked pawn}) 21. Qe6+) 20. Nxc3 bxc3 21. Bxc3 f6 22. Qa7 $1 {The point of the whole combination} 22... Nxb3 (22... Ra8 23. Bxa5 { removing the guard}) 23. axb3 Ra8 24. Ba5 $1 Rxa7 25. Bxd8 fxe5 26. f4 $1 (26. Bf1 Rd7 27. Bxe7 { winning a pawn, but his actual choice is sharper and more consequent}) 26... Ng7 27. Bb6 Raa8 28. fxe5 Nf5 (28... dxe5 29. d6 $1 $18) 29. exd6 exd6 30. Bf2 Rfb8 {It begins to look as though Black is going to save himself after all. However, White hammers away at the weakness of that a1-h8 diagonal and quickly forces the game} 31. g4 { Removing the guard of the critical e7 (7th rank) and d4 (diagonal)} 31... Nh6 32. Re7 Nxg4 (32... Rb7 33. Rxa6 {removing the guard}) 33. Bd4 Rb4 (33... Ne5 { closing the diagonal} 34. Bxe5 dxe5 35. d6 $1 Bb7 36. Rxa8 Bxa8 37. d7 $1 Kf8 38. Re8+ $18 {winning a piece}) 34. Rg7+ Kf8 35. Rxh7 Bb7 36. Rf1+ Ke8 37. Bg7 Rd8 (37... -- 38. Rf8+ Ke7 39. Bh6#) 38. Rf8+ Kd7 39. Bf6+ $1 1-0