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chess problems.
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These are setups of pieces on the chess board that have
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particular solutions.
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And they're very complex,
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and they have a kind of aesthetic form to them.
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And he would aim for certain kinds of elegance in them.
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He never wanted to have an alternate solution.
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He always wanted to have a single kind of solution.
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There are certain themes in chess that refer to different kinds of strategic movements
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that he would bring out through these little arrangements,
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and he would spend inordinate amounts of time organizing them.
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Let me read to you how he describes the action of setting one of these things up: