chess game

Chess game analysis: game 1

Queen's gambit declined

1. d4 d5 
2. c4 Nf6 Queen's gambit declined
3. cxd5 Nxd5 
4. e4 Nf6 White has a strong centre with pawns on e4 and d4
5. Nc3 Bg4 
6. Be2 Bxe2 
7. Ngxe2 e6
8. O-O Bd6 
9. Bf4 Bb4   I missed e5 which forks the knight on f6 and the bishop on d6
10. Bg5 h6 
11. Bh4 g5 
12. e5 Nd5 
13. Nxd5 Qxd5 
14. Bg3 Nc6 
15. a3 Be7 
16. Rc1 h5 
17. f3 h4 
18. Bf2 O-O-O 
19. Qd3 Rdg8  Mistake by white: Queen becomes undefended : d pawn is pinned and the e pawn becomes vulnerable.
20. Nc3 Qd7 
21. h3 Nxe5 
22. Qe4 Ng6 
23. d5 b6  White frees his g1-a7 diagonal and activates dark squared bishop. b6 is inaccurate. It opens the h1-a8 diagonal. Better would have been a6. 
24. dxe6 fxe6  Black did not see the mating threat.
25. Qa8#  1-0