3 | | | | | #Kt| ^Kt| | |
|---------------------------------------|
2 | ^P | ^P | ^P | | | | ^P | ^P |
|---------------------------------------|
1 | ^R | | | | ^K | | | ^R |
+---------------------------------------+
a b c d e f g h

DIAGRAM 4.

Castling is permitted only when neither King nor Rook concerned
has previously moved, when none of the squares between the King
and the Rook are obstructed and when none of the three squares
involved in the King's move are controlled by an adverse man.
Thus if in check (see page 17) the player may not castle. In
Diagram 4, neither White nor Black may castle.


SPECIAL TERMS


Attack and Defense


A man is said to ATTACK another man if he moves so that on his
next move he could capture the other man. Thus, in Diagram 5,
White could attack Black's Bishop by moving his Rook to d1 or to
e6.

A man is said to DEFEND or to PROTECT another man if he moves so