Cozio's Mate Puzzle Two: White to move, Queen mate in two

                                       ♕ A B C D E F G H 8 8 7 7 6 6 5 5 4 ♟ 4 3 ♛ 3 2 2 1 1 A B C D E F G H

Cozio's mate is named after the Italian chess theorist Carlo Cozio. He published this particular checkmate pattern as a result of a positional study in 1766. Cozio also has an obscure opening defense named after him - Cozio's Defense is an unpopular (and self-constraining) variant of defending the Ruy Lopez.

Skeletal example below. Note that black's friendly pieces can be anything other than an unpinned knight to satisfy this particular checkmate pattern.

              ¤ A B C D E F G H 8 8 7 ¤ 7 6 6 5 ¤ 5 4 ∞ 4 3 ∞ ¤ 3 2 ¤ ¤ ¤ ¤ 2 1 1 A B C D E F G H

Having learned about the function and mechanism of Cozio's Mate, try to apply those principles to this more complex position...

Cozio's Mate Puzzle Two: White to move, Queen mate in three

     ♖     ♜ A B C D E F G H 8 ♞ 8 7 ♟ ♟ 7 6 6 5 5 4 ♙ ♟ 4 3 ♙ ♙ ♝ 3 2 ♙ 2 1 1 A B C D E F G H

Sources

Solutions to puzzles

Solution to Cozio's Mate Puzzle 1
MoveWhiteBlackAnnotation
1Qh6+Kg3♕ two spaces away controls the nearest diagonal square, pushing ♚ backwards
2Qh2#1-0The ♛ and ♟ block escape. These could have been any black pieces except an unpinned knight

Solution to Cozio's Mate Puzzle 2
MoveWhiteBlackAnnotation
1
1RxN!RxR♖ removes defender of h6! Black doesn't have any other immediate response to avoid losing 8 points of material without compensation
2Qh6+Kg3Without defender, pattern quickly emerges
3Qh2#1-0The ♝ and ♟ block escape. These could have been any black pieces except an unpinned knight

IronNoder 2018: 07/30

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