# Challenging Ending Study

There are some really nice zugzwang motifs inside this chess problem in both the main line and the variations.

5r1k/2p3pP/3p1P2/3PP3/p7/P2K4/6P1/2B5 w - - 0 1

• 1
No. 1-15
Alena

The king can be checked (perpetual check) if it moves onto c4 and after that onto d4.

Yancey_Ward

Editor

Is that really true, Alena? Compare the two solutions you offered- the first incorrect one, and then the second and correct one. Then consider the line you omit that is important to finish this out: 5....Rxa3.

Alena

The king controls the important square e3. If the king moves onto c4 instead of d4 it will lose a critical tempo.

Yancey_Ward

Editor

And why does 4.Kd4 win and 4.Kc4 only draw?

Alena

Yancey, the problem slipped from my mind. Now you reminded me about it.

1.Bh6 Kxh7
2.Bxg7 Rb8
3.e6 Rb3+
4.Kd4 Kg6
5.Kc4 Rb1
6.g4 Rb3
7.g5 Rxa3
8.Bh6 Rf3
9.e7 Re3
10.f7 Kxf7
11.g6+ Kxe7
12.Bxe3 Kf6
13.Kb4 Kxg6
14.Kxa4 Kf5
15.Kb5 Ke4
16.Kc6 Ke5
17.Bg5 Ke4
18.Bd8 Ke5
19.Bxc7 Ke4
20.Kxd6 Kd4
21.Ke6
It's a winning position for white.

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