Well, I played the weekend Congress in Cumbria and started off well; win over a younger kid rated about 1900, then a forfeit win over a master who didn't show up. Somehow, I was paired with the same master again in round 3, and I held a draw, leaving me with 2.5/3 going into the last day.
I was paired with a weird player; very old guy who plays extremely unconventional openings but obviously studies them (I watched him give a 30 minute postmortem of his round 2 game vs an IM, which started 1.e4 e5 2.a3, where he showed all the lines he'd prepared). I'd seen several of his games and he had a notable tendency to make a lot of pawn moves and dare you to exploit it; we were rated very similar, about 2150 FIDE each. So, off we start:
1. e4 e6 2. f4 d5 3. e5 c5 4. b4 Qb6 5. bxc5 Bxc5 6. Nf3 Bf2+ 7. Ke2 Nc6 8. c3 Bc5 9. d4 Be7 10. Kf2 Nh6 11. h3 O-O 12. g4 f6 13. Kg3 Nf7 14. Qc2 Qc7 15. Kg2 fxe5 16. fxe5 Nxd4 17. Nxd4 Nxe5 18. Rh2 Bh4 19. Kg1
As you can see, he has pursued his weird random style of chess, and I have played relatively normal. When taunted enough, I went for the sac of knight for two pawns, figuring my lead in development and his unsafe king would provide sufficient compensation. However, after long thought here, I couldn't find the winning continuation and he slowly consolidated and I lost. This is the first game in a long time that I can recall just flat out missing a clear (and beautiful) tactical win (by 19...Nxg4 20.hxg4 Qg3+ 21. Qg2 Rxf1+ 22. Kxf1 Qe1#, with other alternatives also losing for him) and when I found it in the computer after the game, it absolutely took the air out of my enthusiasm for the tourney.
I then collapsed in the last round and was beaten like a child by the other IM in the tourney