Queen vs Queen: The Skewer Check

Pure queen versus queen is a theoretical draw so wide you can nap in it, and that fact wins games for whoever knows the exceptions. They all share one shape: the defending king and queen caught standing on the same line, with checks available to exploit it.

The mechanism. A queen cannot be lost to a frontal attack; she simply moves. She is lost when a CHECK forces the king to answer first and the king's only squares leave her majesty on the wrong line. The winning move in this drill checks from a square that keeps aiming at the file where the king shields his queen: no block exists, and wherever the king turns, the next check lines the royal pair up again until the skewer lands.

Where these positions come from: the death throes of pawn races. Both sides promote, someone gives one queen check too few or one king step too casual, and the brand-new queens are suddenly geometrically entangled. The player who has drilled the alignment patterns collects a full point from what the scoresheet says is a dead draw.

The habit to build works on both sides of the board: with queens on, NEVER leave your king on a line with your queen when enemy checks exist, and always scan every available check for a double role. Checks that only check are noise; checks that also aim at something are the whole tactics of queen endings.