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A rich blend of themes. 1…Bg7 is a Roman decoy. The bishop defends against the threat of Rh4 from a new square on the same line, but interferes with the black queen, allowing the white queen to safely unpin. This type of interference is known as a Gamage unpin. The second decoy 1…Sd7 shows the Dresden theme. The original good defence against Bxd3 by the rook is replaced by a bad defence by the knight, which is a second Gamage unpin. 1…Bc5 shuts the queen off from c3, allowing a safe second move unpin.
Dafydd Johnston: The key is pretty obvious, but to appreciate this problem the solver must ask why
the thematic Qf7, Bb1 and Rh1 don't work on move 1 but do after the decoy of the black defenders.
Jacob Hoover: This problem had me stumped for several hours before I finally saw the solution. I found the correlation between the tries and defences intriguing.
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