This game features an unusual defense against the Blackmar-Diemer Gambit. Black offers a Knight sacrifice, but the acceptance of it destroys White's Queen-side pawn structure. When White continued with the normal pawn to f3 gambit, Black destroys the King-side pawn structure. The race is then on, with White trying to get to the endgame before Black can take advantage of the White's exposed King.
Lesson learned: Do not destroy pawn structures on both sides of the board.
P.S. Playing against the computer, but making the moves on a real board seems to solve the problem of playing quickly in response to the chess engine's fast play.