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

DIAGRAM 20.

This is especially true of the mating positions which are
discussed below in connection with attacks instituted by the
Queen in the middle of the game. It is these attacks to which the
beginner at an early stage of the game falls victim in ninety out
of a hundred cases when playing against an experienced opponent.

In the position of Diagram 20 White on the move wins the exchange
and thereby practically the game by playing (1) Kt-d5. With this
move he attacks the Queen and at the same time the Pawn c7.
Black, in order not to lose the Queen, must move her, but he
cannot move her so that she will protect the Pawn c7.

+---------------------------------------+
8 | #R | #Kt| #B | | #K | #B | | #R |
|---------------------------------------|