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Chess is no joke: it has more possible sequences of moves than the number of atoms in the observable universe, but working through chess puzzles is a great way to gain insightful strategies. See more

In the following position, what is the smallest number of moves White can make to force checkmate?

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In the following position, what is the smallest number of moves White can make to force checkmate?

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In the following position, what is the smallest number of moves White can make to force checkmate?

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In the following position, what is the smallest number of moves White can make to force checkmate?

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In the following position, what is White's strongest move?

Input the sum of the coordinates of the target square, where a=1, b=2, ..., h=8. For example, an answer of d5 would be encoded as 9 (d=4, and 4+5=9).

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