In this famous 1972 Spassky-Fischer World Championship, Spassky played 1.a4, and Bobby answered with 1...a5!. This is a typical defensive technique (priyome) in similar positions, to fix the weakness of the a4 pawn.
White to move
a
b
c
d
e
f
g
h
8
8
7
7
6
6
5
5
4
4
3
3
2
2
1
1
a
b
c
d
e
f
g
h
In this Zsofia Polgar-Apol game from 1988, Polgar played the priyome with 1. Bg5! - again a typical maneuver in this pawn structure, to exchange the bishop for the f6 knight and gain control of the d5-square.
Example of Float right title
Float 1
a
b
c
d
e
f
g
h
8
8
7
7
6
6
5
5
4
4
3
3
2
2
1
1
a
b
c
d
e
f
g
h
Position of pieces before castling
Float 2
a
b
c
d
e
f
g
h
8
8
7
7
6
6
5
5
4
4
3
3
2
2
1
1
a
b
c
d
e
f
g
h
Positions of the king and rook after kingside (White) and queenside (Black) castling