how to play chess endgames book

FORTRESSES 207
In the next example, the black king is surprisingly
incarcerated by a rook:
11.41
G.Zakhodiakin
3rd Prize, Shakhmaty v SSSR. 1949
El 1.29 ***/
White has two ways to draw. Find one of them.
1 nc7!
I :§:xe7+? @f6 2 nc7 :§:b8+ 3 @d7 gb7 4
~b7cl'ffr'-+.
1 ... nbS+ 2 @xe7 nb7! 3 nxb7 cl WI 4 @e6+!
@g6
4 ... cJ;f8 s nbs+ 1;g1 6 nb1+ =.
5 hS+! @xhS
5 ... @g5 6 ng7+ @xh5 7 @e7 =.
6 ng7! 'ffr'fl 7 @e7! 'WfS 8 ngS Wih7+ 9 cJ;fS
W/d7 10 ng7 ~e6 11 ngs W/d6+
Or: 11... Wif6+ 12 @e8 =: 11...Wi'fS+ 12 @e7
= (12 'l)e8? W/f6 -+).
12 cJ;f7! =
Black cannot free his king.
Ell.30 **/
The sprint of the b-pawn cannot
be stopped, can it?
Exercises
(Solutions on pages 329-30)
It is impossible to show here all the known patterns
for incarcerating the king. But if you manage
to solve the following exercises, you will
learn a few more.
Ell.31 **/
Turn the stray white horse into a monster!