7. g3. This is just the first of many winning moves white missed, in addition to his many losing blunders.
White had lots of winning opportunities here, and just blundered away his lead at the end. Most notably 15. c5??, losing massive amounts of material, and 16. Kf1??? walking into a mate in two after 16. ... Qxf2+ 17. Qxf2 Rxf2#. 15. Be4 is much better, but even after 15. c5?? Nxd3!, white is not totally lost after 16. Qxd3 Qxf2+ 17. Kd1 Qxg1+ 18. Kc2 Qxg3 19. Qe4. He is down two pawns and his king is somewhat exposed with his queenside very cramped, but black's light bishop is completely useless as is his queenside rook, and white has a dangerous pawn on h5 (in particular, dangerous maneuvers like Rg4 followed by h6 or Bh6). I would be interested in seeing a game from this position, although black still looks much better.
This was a recent 10 min blitz game, where I played as black, and though my opponent's opening was strange, so too was my response!
In what has the feel of a 'queenside' Alkehine Defence, my 3 first moves are knight moves, but when the pawn formations take hold, an aggressive barrage of tactical positions and a messy, battle-ridden board made for an exciting short game, ending in a striking tactical blow: