This game took place in the IWICA chess tournament in Bangkok. Criticisms are welcome. I played White.

8.Nxc6 looks wrong.It allows d5,which should be severly restricted mabe Nb3 was better

corean

Very nice game. I enjoyed it a lot. 18. Bxf7+ followed by 19. c3 was strong!

hmm.. so if black played properly with d5, would black have won?

First of all, congratulations! A nice win over a much higher rated opponent is always something to be proud of.  I don't agree with the criticism of 8.Nxc6. It's true that this move is sometimes an error, because it let's black reenforce his center and support the d5 push, but it also saves a tempo for White. The key is keeping a lock on d5, so that he can't free his game easily. Keeping that in mind, I would have prefered 12.Rad1 to your 12.f4. Black could have equalized the game with 12...d5

After 12...Qa5, you had a typical combination available for several moves that you and your opponent both overlooked. It's worth studying this tactic, because it comes up more often than you think. You could have played 13.Nd5! The key features here are Black's unprotected Q on a5 and N on d7. If he plays 13...Qxd2, you don't recapture immediately, but play 14.Nxe7+ first, winning a piece. His best is 13...Qd8 and you then have 14.Bb6 with a very good position.

The same possibility (Nd5!) continued to exist on move 14, where it would have given you a decisive edge, and on move 15 (Nxd5!) where it wins immediately.

After 16...Bb4? you finished the game very nicely.

Wow! I really did not see that Nd5! Maybe I wasn't keeping an eye out for tactics because I was playing such a powerful opponent... Thank you for showing me.

Great game Wonji - you deserved first place in your age

I might have to post one of mine from that tournament now :)

Nice game.. you played well