In the tournament I played in last weekend, against GM Maurice Ashley, I had a fairly good grip on the position against the Pirc, but I played too aggressively, which allowed counterplay, and ... well, that was that. I didn't see a critical knight fork (queen, bishop, and pawn) but by that time I'd lost pretty much all of my early advantage anyway.

At least I made him sweat a little bit. My third round game, my opponent played 1.d4 Nf3 2.c4 e6 3.Nc3 Bb4 4.g3, which is a lesser variation that (even in my best playing days) I wouldn't have known much about. I screwed up that game pretty well. :-(