Two Knights Endgame - Position of Mutual Zugzwang

Position of Mutual Zugzwang

Troitsky

	a	b	c	d	e	f	g	h
8									8
7									7
6									6
5									5
4									4
3									3
2									2
1									1
	a	b	c	d	e	f	g	h

White to move draws; Black to move loses

There are positions of mutual zugzwang in the endgame with two knights versus one pawn. In this position, White to move draws but Black to move loses. With Black to move:

1... Kh7

2. Ne4 d2

3. Nf6+ Kh8

4. Ne7 (or 4.Nh4) d1=Q

5. Ng6#

With White to move, Black draws with correct play. White cannot put Black in zugzwang:

1. Kf6 Kh7

2. Kf7 Kh8

3. Kg6 Kg8

4. Ng7 Kf8

5. Kf6 Kg8

6. Ne6 Kh7! (but not 6...Kh8? because White wins after 7.Kg6!, which puts Black to move)

7. Kg5 Kg8

8. Kg6 Kh8

and White has no way to force a win (Averbakh & Chekhover 1977:106).