Fundamentals (part 20)

DT Lee (137) - Spanton (147)
Barbican (London) Rapidplay 1991

White to make his 47th move - what should the result be?

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47.Kc5?
Both 47.Ke4 and 47.g3 draw, eg 47.Ke4 h4 (not 47...g4? 48.g3 Ke7 49.Kf5 Kf7 50.Kg5 etc) 48.Kd4 g4 49.Ke4 h3 50.gxh3 gxh3 51.Kf3 Kxe5 52.Kg3 Kd5 53.Kxh3 Kc5 54.Kg3 Kb5 55.Kf3 Kxa5. You may recall from my post The Power Of Two Squares (https://beauchess.blogspot.com/2020/02/the-power-of-two-squares.html) that this is only a win if the Black king can reach b2 or b1. A quick calculation shows that here Black is one tempo short, so the position is drawn.
The game finished:
47...Kxe5 48.Kb6 Kd6 49.Ka6 Kc6 (the white king cannot reach b7 or b8, so White cannot force the a pawn through to queen) 50.Ka7 Kc7 51.a6 h4 52.Ka8 g4 53.g3 Kc8 (not 53...hxg3? 54.a7) 54.Ka7 h3 55.Ka8 h2 0-1