how to play chess endgames book

34 How TO PLAl' CHESS ENDGAMES
B
10 ..t;,bs .lid3 11 a7 lta3 12 ..t;,b6 llb3+ 13 ..t;,c7
.lic3+ 14 ..t;,b7 .lib3+ = since the white king's
only shelter from the checks is in front of the a-
pawn.
2 ... e3 3 a7 e2 4 a8'& el~
White's own pawn prevents him from winning,
even though he can give the important
first check:
5 .liaS+ ..t;,g4 6 ~g8+ @£3 7 ~f7+
For the rest, see exercise El3.03.
In rook endings it is often justifiable to give
up a pawn in order to activate the rook.
3 ... bS 4 b4 .!ld4 5 ll:b3 hS 6 ..t;,g2 ..t;,£7 7..t;,f3
7 f4!? was simpler, as Lukacs showed in
CBM: 7 ...@e6 8 ..t;,f2 ..t;,f5 9 @f3 .lie4 10 .lic3
.lixb4 II b3 =.
7 ....lic4 8 ..t;,e3 g5!
Following the principle of two weaknesses,
Sokolov seeks activity on the kingside as well,
to complicate White's task further.
9f4?!
This move creates a lot of holes and weaknesses,
yet the margin of the draw in rook endings
is so great that even this does not overstep
it. It would have been much better to create a
passed pawn of his own and become active: 9
hxg5 fxgS 10 f4 gxf4+ 11 gxf4 ..t;,e6 12 .lid3
.lixb4 13 b3 ms 14 lld5+ ..t;,g4 15 llg5+ ..t;,h4
16 llgl .lixb3+ 17 ..t;,e4 = (Lukacs).
9 ... gxh4 10 gxh4 ..t;,g6 11 .lic3! .lixb4 12
ltcS!
Textbook active defence.
12 ....lib3+ 13 ..t;,e4 ~xb214 rs+ ..t;,h615 .lic6
.lib4+ (D)
w
B
1.24
E.van den Doel -1.Sokolov
Dutch Ch ( Leeuwarden} 2004
1..J!d8! 2 .lixa7 ltd3 3 lta3
The roles of the rooks have been completely
reversed, but it is not so easy for White to release
his rook from its passive role.
16@f3?
But now White displays fatal passivity. 16
..t;,d5! was necessary: 16 ... llxh4 !7 :l;{xf6+ ..t;,g5
18.lif8.lihl 19 f6..t;,g6 20@e5 lle1+21..t;,f4 b4
22 "1b8 .!if!+ 23 ..t;,g3 .libl 24 .lib6 =.
16 .•. ~xh4 17 llxf6+ @gS 18 ~g6+
18 ltb6 .lif4+ 19 ..t;,g2 ltxf5 -+.
18 ... ..t;,xfS 19 llb6 ltb4 0-1
It is also very important in the endgame of
rook against two minor pieces for the side with
the rook to seize the initiative and play actively,