how to play chess endgames book

ZVGZWANG 181
10.11
R.Reti - F.Marshall
Baden­Baden 1925
The white knight is on its best square and in
any case cannot lose a move, so the king must
do the job himself. Since the black king has to
stay on the f-file, he cannot copy the triangulation
manoeuvre.
l@g3
Or l @h3 @f5 2 @g3 @f6 3 @g4 +-.
1 ... @fS 2@f3 ©f6 (D)
On each turn the black king has to move to a
square of the opposite colour, whereas White
can stay on light squares: 2 ... g4+ 3 @g3 +-.
10.12
Y.Shulman - A.Abdulla
Dhaka 1999
1 .•• @e7!
Since both sides have an equal number of
spare moves available, Black dare not step on
the 'mined' e6-square: l ... @e6? 2 @d4 h6 3 h3
g5 4 g4 +-; l ... g5? 2 @d4@e6 3 g4 h6 4 h3 +-;
l ... h5? 2 @d4 @e6 3 h4 +-, with a fatal zugzwang
in each case.
2@d3!
White cannot advance either.
2 ... @d7 3 @c3 @e7 1/z.1/z
Exercises
{Solutions on page 322)
3@g4 1-0
The number of spare moves that both sides
have available is often a very important factor
in pawn endings. It is not always so prominent
as in the following 'Don't touch me' position.
El0.11 /**
Can Black make any progress here?