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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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A mate in two problem

With the rook on e6, Bb6 is mate in two. For instance Bb6 d2 2. Qb3 mate or 1. ... N any 2. Qc5 mate or 1. ... Kc3 2. Qc1 or 1. ... Kc5 2. Qxd3 or 1. ... Ke4 2. Qxe4
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