how to play chess endgames book

ZUGZWANG 179
El0.09 /**
How did Black save the game?
10.08
Original
Black is also on the edge of a precipice.
2We4We6
2 ... Wg6 3 Wf4 (zugzwang) leads to the main
line.
3Wf4
3 g6? Wf6 4 g7 ~xg7 5 ~f5 Wf7 = and
Black holds the draw thanks to the opposition,
which is ultimately also based on zugzwang.
J wr, 4 wrs wg7 s g6 @h6 6 g7i ~h7
6 Wxg71 @g5 +-.
7 g8\W+ @xg8 8 @g6 @h8 9 gs @g810 @h6
+-
El0.10 ***/
White to play and win.
Once again, endings with knights provide
the most examples.
C) Reciprocal Zugzwang
In contrast to normal zugzwang positions, here
both sides are in zugzwang. So the greatest caution
is required if you discover a mutual zugzwang
position in a relevant variation. Since by
definition this can no longer be interpreted simply
as a weapon for one side, both sides must
tread with great circumspection.
In the following position, White must exercise
the greatest vigilance right from the start.
l~f3!
I Wf4? Wg6 (zugzwang) would lead directly
to the loss of the g5-pawn.
1 ...@f7!?
10.09
Based on Z.Varga-P.Acs
Budapest 1999