Your adversary, you will observe, has the advantage in
point of force, but this is counterbalanced by the situation, which
enables you to draw the game. To do this, you must first play your Queen
to one of the three squares where she will check the King, _i.e._, to
K's 4th, Q's 5th, or Q. B's 6th; it is indifferent which, say,
therefore, Q. to K's 4th (check). Black has no option, his King cannot
move, he must interpose his Queen. If now you were to take the Queen you
would lose the game, on account of his two Pawns; but instead of doing
so, you play the Queen to King's 8th sq, giving check. The black Queen
must again interpose; you repeat the check at K's 4th, Black can only
parry it with his Queen, and you may persist in giving the same two
checks, _ad infinitum_. In such cases, the game is resigned as "drawn by
_perpetual check_."
No. 11
BLACK.
+---+---+---+---+---+---+---+---+
| K*| Q*| | | | | | |
+---+---+---+---+---+---+---+---+
| P*| | | | | | | |
+---+---+---+---+---+---+---+---+
| | P*| | | | | | |
+---+---+---+---+---+---+---+---+
| | K | | | | | | |
+---+---+---+---+---+---+---+---+
| | | Q | | | | | |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
WHITE.
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