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Often, a puzzle type of problem in which a tactical or positional solution is required, like White/Black to move and win”, in what is often a middlegame or endgame-esqe position. But a puzzle can also be a chess riddle, chess math, or any other non-normal chess problem. Questions about solving puzzles, puzzle apps and websites, how to understand the idea behind a puzzle, etc. are also on-topic.

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Why is this a checkmate?

To get out of check, the king needs to move to a square that isn't attacked by any opposing pieces, or you need to capture/block attacking pieces such that the king is no longer under attack on its cu …
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