azaris: Some thoughts about this game:
<4...e5!?>
A bold move befitting Black's intentions of winning at all costs. Perfectly benign is 5. dxe5 dxe5 6. 
xd8+ 
xd8 7. 
g5+ f6 8. O-O-O+ 
d7 9. d2 and Black should be just fine.
<10...e4!>
Seeing White has completed his development Black doesn't stand around waiting for his opponent to play e4 but plays it himself, grabbing vital squares that White needs to undo his cramped position.
<15. e4?>
Dangerous, probably losing move. The pawn on d4 is the only thing stopping the Black bishop's murderous gaze from h7.
<21...cxd4!>
The star move. White can't hope to win the exchange and not lose the game. If 20. c7? then 20...e5 21. d1 (21. b1 d3 
) exf3+ 22. gxf3 h3 23. g2 f4+ 24. h1 xe2 25. xe2 d3
<24. c5>
24. cxb5 xd5 25. exd5 
xe2 26. xe2 xe2 27. xe2 d3
<28. Rd2>
28. f2 d8 29. xg7 xg7 30. e3 e4 31. f4 f5 32. h4 d2 33. f1 f4 34. xf4 c3 35. h2 d1= 36. xd1 xd1
Like Berliner has said, pawns are very important and despite all the excitement that goes on here, it is the lowly d-pawn that finally wins the game. White made a mess of his position by ignoring development of his pieces and trying to control the center with pawns alone.
