2012 KCCC Gets Irrational in Round 2

Black to play.

I have annotated the game Hart - Goeller from the second round of the 2012 Kenilworth Chess Club Championship.  The game quickly reached a rather "irrational" position so that we ended up spending a lot of time just on the opening.  It was an interesting game to play, however, and made me think again about the Dunst Opening (with 1.Nc3) which used to be part of my own repertoire.