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Blue Queen Chess: A third queen, painted blue (or otherwise uniquely marked), starts on one of the central squares, and can be moved by whichever player has the move. According to the novel in which I first heard of this, it is also possible to capture the blue queen. Finally, confirmation that the game was not a fiction of the novel: http://nielsenhayden.com/makinglight/archives/006433.html
White (to move) can still force mate with King and Queen against King in most of these variants.
SOMETIMES MATES: Max-distance-queen chess, and Deposable queen (Cinderella? Were-Queen?).
NEVER MATES: Virgin chess, Negative relay queen chess, Nice-queen chess, also this bare king endgame cannot happen in Revive-queen chess.
Deposable queen (Cinderella? Were-Queen?): If a promoted Queen crosses or lands on its side's second rank, it turns back into a pawn.
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