Tuesday Night Marathon Halfway update

After 4 rounds out of 8 of the Mechanics Institute Tuesday Night Marathon I'm in a 6-way tie for 1st place with 3.5/4 after a draw against FM Frank Thornally in round 4. I can't say I've been too happy with my play, I got a nice advantage out of the opening in round 4 and was unable to figure out a proper continuation from a tricky position. In round 3 I was busted in a position where I missed that my opponent could force me to sacrifice a piece for 3 pawns but then swindled out the win in an endgame where I still had the 3 pawns for the bishop.