My first round I played an older gentleman who'd been to the world open 7 years total (we chatted a bit pre-game). He was rated a hundred points below me though. Of course I know better than to underestimate my opponents!
I thought I played very well. Perhaps not with 100% perfect accuracy but perhaps as close as I've gotten.
It's already almost half-past midnight & I got another matchup at 11AM so I haven't analyzed with an engine. As always though, comments welcome!
Anyway, here it is (my comments are below) :
[Event "World Open"]
[Site "Philly"]
[Date "2008.07.02"]
[Round "1"]
[White "David J White"]
[Black "Narz"]
[Result "0-1"]
[ECO "B30"]
[WhiteElo "1444"]
[BlackElo "1552"]
[Annotator ",Narz"]
[PlyCount "70"]
[TimeControl "40/2 hours + 1 hr sudden death"]
1. e4 c5 2. c4 Nc6 3. Nf3 g6 4. Be2 Bg7 5. O-O d66. d3 f5 7. a3 Nf6 8. Qc2 O-O 9. h3 Bd7 10. Bd2 Nd4 11. Nxd4 cxd4 12. Bf3 Bc6 13. Bg5 Nd7 14. Qe2 Ne5 15. Nd2 Qd7 16. b4 b5 17. cxb5 Bxb5 18. Nc4 Bxc4 19. dxc4 f4 20. Rac1 h6 21. Bh4 g5 22. Bxg5 hxg5 23. Bh5 f3 24. Qd2 Rf4 25. Qxd4 Raf8 26. Rcd1 Rh4 27. Qd5+ Kh8 28. c5 Rxh5 29. cxd6 fxg2 30. dxe7 gxf1=Q+ 31. Kxf1 Qxh3+ 32. Ke1 Qc3+ 33. Ke2 Rxf2+ 34. Kxf2 Rh2+ 35. Kf1 Qf3+ 0-1
Notes : rather odd opening, I've only seen it in blitz online. The bishops lose scope & d3 can be a target. I decided to put my bishop on the long dialog to take advantage of white's potential dark square weakness.
With 7. ... f5 I wanted to gain some space & create some tension in the positon & hopefully have attacking possibilities later. Simply 7. ... Nf6 might have been "objectively better" (though I'm not even sure that's true) but it would lead to to the type of game I find dull so I tried the sharper move instead.
With a3 & h3 it seems my opponent is wasting time, trying to figure out what I am up to. I did my best to try to show him.
With 9 ... Bd7 I am planning to meet exf with gxf!? and try for a kingside assault.
I though about my tenth move for a while. Originally I had ideas of Rb8 and b5, breaking up the queenside but this also freed up white's position & created threats for him along the a2-g8 diagonal. So with 10 ... Nd4, I am just simply aiming to cramp white's position (if he takes & really he almost has to, his knight loses it's only square & white must waste more time).
12. ... Bc6 (again, I thought for a long time about this, considering e5 but decided ultimately that Bc6 is more active, I'd glad I made this choice.
13. ... Nd7 (with the idea of Ne5, a great square for "him")
14. Qe2 (I have to be careful, he's threatening exf and Bxe7)
14. ... Ne5 (my knight reaches a nice square where he will stay exerting pressure for a long time!)
15. Nd2 (seems like a most logical move but perhaps I missed... [see below])
15. ... Qd7 (another seemingly logical move, getting out of the way of the pin, linking my rooks & preparing f4 with the aim of trapping the bishop, maybe I'm just tired but I'm not seeing now why I couldn't have played f4 right away)
16. b4 b5 (white tries to strike back somehow)
17. cxb5? (mistake) Bxb5
19. ... f4 (I could have played d3 here with the idea of Nxf3+ and then Bxa1 but I didn't want to give the bishop a way out and I didn't care about the a1 rook anyway).
20. R(a)c1 (I didn't understand this move @ the time & I still don't

)
22. Bxg5 hxg5 (I toyed with 22. ... d6 here but it didn't seem to do much)
23. ... f3 (if B takes then R takes & white gets mated or loses his queen, if g takes I think I still have a mating attack)
25. Qxd4 (nooo, my awesome d-pawn! Also, white is threating the highly embarsssing Qd5+ which I might have overlooked in my lust for blood even just a few months ago)
25. ... R(a)f8 (safety first)
26. R(c)d1 (when he touched the piece I figured he'd try Rc3)
27. Qd5+ (spite check)
28. c5 Rxh5 (taking the bishop was the best move I could see)
29. cxd6 fxg2 (the fancy Rxp was no good in my calculations unless white played into the mate)
30. dxe7 (threating my queen & to get a new one with check. I didn't see a forced mate here but I figured there had to be one. I avioded the "safe" pxR=Q and then Qxe7 and went all out for the kill!)
30. ... gxf1=Q+ 31. Kxf1 (Rxf1 probably better, then I might have nothing better than capturing e7 with the queen)
31. ... Qxh3+ 32. Ke1 Qc3+ (blocking with either the R or Q leads to Rh8+ followed by Qf6 mate)
33. Ke2 Rxf2+ (Rook sac!!

)
34. Kxf2 Rh2+ 35. Kf1 Qf3+
Mate next move, white resigns.
Edit : on move 30 after dxe7 I missed a two move checkmate (Nf3+ Kxp and then Qxp mate

)