(1) P-e4, P-e5; (2) Kt-f3, Kt-f6; (3) Ktxe5, Ktxe4; (4) Q-e2, Kt-
f6. Black's last move exposes his King to a discovered Check, and
White wins the Queen by playing (5) Kt-c6+.

Next to the Knight the Queen is most frequently in a position to
carry out a double attack. Two typical examples are shown in the
following diagrams.

After the opening moves (1) P-e4, P-e5; (2) P-f4, B-C5; (3)
Pxe5?? the position of Diagram 23 is reached, in which Black wins
a Rook by Q-h4+. White cannot reply (4) K-e2 on account of Qxe4
mate. His only move is (4) P-g3 and then follows Qxe4 attacking
King and Rook simultaneously.

This opening offers another opportunity to demonstrate the
dangerous mobility of the Queen. Instead of (3) Pxe5 White should
have played (3) Kt-f3. The game could then have continued as
follows: P-d6; (4) B-c4, Kt-f6; (5) Pxe5, Pxe5: Again White
cannot win the Pawn e5 for (6) Ktxe5 would be answered by Q-d4,
attacking Knight and Bishop and threatening mate on f2.

+---------------------------------------+
8 | #R | #Kt| #B | #Q | #K | | #Kt| #R |
|---------------------------------------|
7 | #P | #P | #P | #P | | #P | #P | #P |
|---------------------------------------|
6 | | | | | | | | |
|---------------------------------------|
5 | | | #B | | ^P | | | |
|---------------------------------------|