Annotated Chess Game 9222464 by nivi1979

1. d4 Ng8f6 2. c4 e6 3. Nb1c3 d5 4. Bc1g5 Bf8e7 5. e3 O-O 6. Ng1f3 b6 7. cxd5 exd5 8. Bf1d3 Bc8g4
till now you played theory and the most common move here is Bb7 which makes sense with b6 (2 moves ago) Yet this is not a mistake.
9. h3 Bg4h5 10. g4 Bh5g6 11. Qd1c2 c5 12. b3
There was a tactic here involving Nc6->cxd4 and if takes with knight there is Nxg4. you both missed it.
12... Nf6e8
? giving away important pawn on d5.
13. Bg5xe7 Qd8xe7 14. Nc3xd5 Qe7b7 15. Bd3e4 Bg6xe4
Fritz says its a mistake. I can't see why.
16. Qc2xe4 Ne8d6 17. Nd5e7 Kg8h8 18. Qe4xb7 Nd6xb7 19. O-O Rf8e8 20. Ne7f5 Nb8d7 21. dxc5 Nd7xc5 22. Rf1d1 g6 23. Nf5h6 Kh8g7 24. g5 f6
? clears the 7th rank and invites Rd7+ knight check. (b4 should be played first to remove guardian knight from c5.
25. h4 fxg5 26. hxg5 Ra8d8 27. Kg1g2 Rd8d6 28. Ra1c1 Re8d8 29. Rd1xd6 Nb7xd6 30. Rc1d1 Nc5b7 31. Nf3d4 Rd8c8 32. f4 b5
? the pawn is take-able as after Nxb5 there is Rd7 picking up knight in b7 and controlling back rank.
33. Kg2f3 a6 34. Nh6g4 Rc8e8 35. Ng4f6
good move, slightly improving your piece position while waiting fo opponent to make mistake.
35... Re8c8 36. e4 h5
? weakening g6 inviting the attack that came.
37. f5 Rc8c3 38. Kf3f4 h4 39. e5 Nd6f7 40. Nd4e6 Kg7h8 41. fxg6 Nf7xg5 42. g7
Nice mate.