1. d4 D80: Gruenfeld: Unusual White 4th moves and 4 Bg5 1... Nf6 2. c4 g6 3. Nc3 d5 4. Bg5 Ne4 5. Nxe4 dxe4 6. Qd2 Bg7 7. O-O-O Nc6 d4 draws heavy fire. last book move 8. Qf4?? not a good decision, because now the opponent is right back in the game 8. e3 O-O 8... O-O?? Black has let it slip away 8... h6 and Black gets the upper hand 9. Bh4 g5 (9... Bxd4?! 10. Qxe4? doesn't work because of (10. Qd2 ) 10... Bxb2+ 11. Kc2 Qxd1+ 12. Kxd1 Bf5) 10. Qxe4 gxh4 9. Bh6 9. d5 f6 10. Bh6 Bxh6 11. Qxh6 Ne5 9... e5 Black launches an attack 9... Nxd4? is a blank shot 10. Bxg7 Kxg7 11. e3 10. dxe5 Bxe5 Black creates threats along the open d-file 11. Qd2 11. Qxe4? is inferior since it leads to 11... Bxb2+ Demolishes the pawn shield 12. Kxb2 Qxd1 11... Qxd2+ 12. Rxd2 Re8 13. h4 Bf5 13... Be6 14. e3 14. h5 Nb4 15. hxg6 15. g4 Bxg4 16. hxg6 fxg6 15... Bxg6 16. e3 Covers d4+f4 16. a3 is the best option White has 16... e3 17. Bxe3 (17. fxe3 Na2+ 18. Kd1 Rad8) 17... Na2+ 18. Kd1 16... Nxa2+ 17. Kb1 Nb4 18. Be2 Red8 19. Rxd8+ Rxd8 20. Nh3?? White falls apart 20. Kc1 20... Rd2 21. Re1 21. Nf4 is the last straw 21... Rxb2+ 22. Kc1 Na2+ 23. Kd1 Rb1+ 24. Kc2 Rxh1 25. Nxg6 hxg6 26. Bf4 Rc1+ 27. Kb3 Bxf4 28. exf4 21... Rxb2+ 22. Kc1 Plans Bf1 22... Na2+ 22... Bc3 23. Rg1 Ra2 24. Bd3 exd3 25. Rd1 Ra1# 23. Kd1 Black now must not overlook the idea Bg4 Fritz 6: 23. Kd1 Bc3 (Fritz 6: 23... Nc3+ 24. Kc1 Na2+ 25. Kd1 Bc3 -#6/7) 24. Rh1 Bd2 25. Bg7 Kxg7 26. g4 Nc3# -#4/7 0-1 [Fritz 6 (30s)]