how to play chess endgames book

100 How TO PLAY CHESS ENDGAMES
Exercises (Solutions on page 326)
C) Pawn-Barriers
Sometimes the defender succeeds in constructing
a fortress system in which the whole board
is divided by an impenetrable bani er of pawns.
Then even a very great material advantage is often
not sufficient to win, since the king (or
sometimes also other pieces of the attacker)
cannot enter the enemy half of the board. Probably
the best-known example of a such pawnbanier
is the following:
Ell.18 **/
How did White break through?
B
11.31
A.Petrosian - L.Hazai
Belgium 1970
Ell.19 /**
How did Black set up a fortress?
El 1.20 **/
How did White destroy Black's set-up?
1...'&b6!? 2 loxb6+??
Humans are simply too greedy! With 2 \Wd2,
followed by @b3, lob2, @a4 and lod3-cl-b3,
White would have won the a5-pawn and subsequently
the game.
2 ... cxb6 3 h4
Otherwise Black would have blocked the position
completely with 3 ... h4.
3 ••• gxh4 4 ~d2 h3!
When White played 2 loxb6+ ??, was this the
move that he overlooked?
5 gxh3 h4 1/z-1/z
In this example, the pawn-banier was so impenetrable
that no pieces at all were able to penetrate
it. This is not always necessary for a
successful defence.
In the following diagram, it is sufficient for
Black to keep the white king out of his camp
using a pawn-barrier. The white rook alone is