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Chess problems consist of a board position and a task. Most ask for a line of play that mates black in a set amount of moves, or a combination that results in a winning position. Many other types exist, including, but not limited to, construction tasks for various positions and proof games that have numerous goals, selfmates, helpmates, and retrograde analysis. Tournaments and championships exist for composing of original problems and for speed-solving.

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What's the deep idea behind this puzzle?

Corridor mate A king behind a continuous line of pawns can be checkmated by a rook or queen Your puzzle is related to the following setup. [FEN "6k/5ppp/3R/7/7/1/1/3K1 w - - 0 1"] 1. Rd8# In this …
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