2014 US Open Round 7: GM Chirila-Madison
Well, I finally lost one. Granted it was to a 2600 and I had black, but I still had good chances.
The thing I can be really proud about is that I went toe to toe with a 2600 and made a great game of it. I had chances most of the game and came up with some creative solutions to problems even though I couldn't pull it out in the end.