Fundamentals (part 23)

Spanton (156) - Russell Goodfellow (155)
Kings Head (London) U160 1991

White to play and win

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46.fxe5+??
This turns a win into a loss. Correct is 46.Kc4 or 46.a4 or 46.Kc5 etc. I guess that instead of calculating I must have been too afraid of the general concept of allowing a protected passed pawn.
The game finished:
46...Kxe5 47.c4 f4 48.c5 f3 49.c6 f2 50.c7 f1=Q+ 51.Kb6 Qb1+ 52.Kc6 Qc2+ 53.Kb7 Qb3+ 54.Ka8 (or 54.Kc8 Kd6, eg 55.Kd8 Qg8#) Qxa3+ 55.Kb7 Qb4+ 56.Ka8 Qc5 57.Kb7 Qb5+ 58.Ka8 Qc6+ 59.Kb8 Qb6+ 0-1