how to play chess endgames book

FORTRESSES 197
l O l;Ie2 +-) 9 !l:f5 gd2 10 !l:f2 gg5 11 @g7
@e7 12 !l:e2+ @d7 13 @f7 @d6 14 !l:e4 @d5
15 !l:e6 +-.
b) 2...gr2 3 g5 gd4 4 h4 gr2 5 @e5 gc5 6
@f4 gd4 7 @g4 ge5 8 h5 gxh5+ 9 @xh5 and
White wins, as Elkies pointed out (see 14.04).
2h4(D)
gcs 17 !l:c2 ge3 (l 7 ... gd6 18 !l:d2 gc5 19
@f4 ge7 20 !l:d7 .ars 21 @g3 gd6+ 22@h3
gf4 23!l:d5++-) 18@e4gh6 19 !l:h2gg7 20
@f4 gf8 21 @f3 ga3 22 !l:a2 ge7 23 !l:e2 gf6
(23 ... gxh4 24 !l:h2@g5 25 l;Ihl and Black is in
zugzwang and loses his bishop) 24 @f4 gd8
(D).
Now Black must exercise the utmost caution:
2 ... gal =
This is the correct square for the bishop,
since after 2 ... gd4? White can gain a decisive
tempo: 3 !l:b4 gc3 4 !l:c4 gb2 (4 ... geJ 5 @f6
@h7 6 !l:c6 gxg3 7 @gS +-) 5 g4 hxg4 6 !l:xg4
@h7 7 @f7 @h6 8 !l:xg6+ @hS (D) and White
wins, but it is still amazingly complicated:
25 !l:c2! (domination!) 25 ... ge7 26 !l:d2 gb4
27 !l:d8 gc3 28 @g3 ge5+ 29 @h3 gf4 30
l;Id5+@g6 31 @g4 +- and White wins easily,
now that the king and the rook have exchanged
roles.
The second fortress is:
9 !l:g21 gc3 10 !l:h2 geJ 11 @f6 gg3 (if
I i...gxh4+?\, then 12@f5 +-) 12!l:hl gf2 13
@fS ge3 14 J;!h2 ga7 15 !l:a2 gb6 16 !l:b2
11.28
S.Tiviakov - R.Korsunsky
Frunze 1989
This fortress is vulnerable, however, since
the a7-gl diagonal is shorter and the white king