Fundamentals (part 52)

Wiep Terpstra (1794) - Spanton (1946)
Olomouc (Czech Rep) Seniors 2018

White has just captured on e3 - who stands better?

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Black is winning.
42...f5
This gives the king a route to d5, from where it can occupy e4 or c4 depending on circumstances. Equally strong is 42...Ke6 as 43.e4 runs into 43...g5 (43...f5 44.e5 g5 also wins).
43.Kf2
If 43.b3 Ke6 44.c4, covering the d5 square, Black wins easily with 44...bxc4 45.bxc4 Kd6 etc.
43...Ke6 44.b4
Or 44.b3 Kd5 45.Ke2 Ke4 and the white king will eventually have to give way.
44...axb4 45.axb4 Kd5 46.Ke1 Ke4 47.Ke2 h5 48.h4 g6
White is in zugzwang. The game finished:
49.Kd2 Kf3 50.Kd3 Kg4 51.c4 Kxh4 52.cxb5 cxb5 53.e4 fxe4+ 54.Kxe4 Kg4 55.Ke3 Kg3 56.Ke4 h4 57.f5 gxf5+ 58.Kxf5 h3 59.Ke5 h2 60.Kd5 0-1