MLK Classic Open Section - 2014

My last game, before I withdrew from the tourney, I was quite upset with, but perhaps not so much.  I played the opening well enough against a "lesser" opening from white, and got a good advantage.

I traded wood down to the exchange, then with 20min left on my clock I calculated the ending for 10 minutes (correctly), then misplayed it and lost. (Again with a silly Q check at the end)