No one can win a game of chess unless the opponent goes wrong, so it might be said that inducing error is one of the primary tasks facing the tournament player. This assumes of course that one's technique is up to exploiting the error. There are many ways to send the opponent down the path to danger, and a popular one is playing an unexpected opening variation.
A few months before this game I had spent some time looking through a monograph on the Schliemann Defence by the Hungarian master Tibor Florian. I was reasonably prepared for the main lines, but got a pleasant surprise when my opponent wandered into a sideline that had first been seen in the nineteenth century.
Forbes G - Scoones D
B.C. Championship (1) 1977
Spanish Game C63
1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.d4?!
The correct move here is 4.Nc3.
4...fxe4 5.Nxe5 Nxe5 6.dxe5 c6 (diagram) 7.Bc4?!
White has already gone wrong but this accelerates the negative trend. For better or worse the piece sacrifice 7.Nc3!? must be tried. I remember having an improvement on Florian's analysis but I can't remember what it was.
7...Qa5+ 8.Nc3 Qxe5 9.Bxg8 Rxg8 10.Qe2 d5 11.f4 Qf6 12.Bd2 Qh4+ 13.g3 Qh3
White is a pawn down and is being overrun on the light squares. No further commentary is required.
14.Nd1 Bg4 15.Nf2?! Bxe2 16.Nxh3 Bf3 17.Rg1 Bc5 0-1
It is always great to start a tournament with a quick win, especially as Black!