Facebook tournament, pt. 2

As promised, my second victory in this facebook tournament: Drew Parker_Ed Brosky_2009_2_12_12_51.pgn
Comments: 12. O-O: A mistake. I need to look after my c4 pawn, as its only defender is about to be lured away. I should have played 12. Nxe5. 24. Qxa6: Restored material equality, but my position is terrible. My own a-pawn will be impossible to defend without becoming completely passive. 33. Rxc5!: Amazingly, this move seems to either win a pawn or force perpetual check. It is easy enough to see that taking the rook leads to either a perpetual check or, if the black king ever reaches e8, a skewer of king and queen and I'm up a queen vs. a rook. The only moves I had to worry about are Re1+, which leads to a draw according to Rybka, and Qb1+, trying to avoid the eventual skewer. But in this line, white has complete control over the 7th and 8th ranks from the c-file to the h-file, so a perpetual check will be easy. My opponent chose Re1+ followed by dxc5, and didn't see the skewer, so after 40... Ke8 41. Qh8+, black resigned. My two games in the king's indian defense have not gone very well, so I should avoid playing 1. d4 until I have learned more about the opening. I have another game in a Taimanov Sicilian that I am just losing terribly, and a couple of endgames which seem like draws. But endgames are such an easy place to make a fatal mistake that they could each go either way.