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But in chess, can you really question why you make that or this move and have an answer qualitatively different from 'it seemed like a good idea at the time, I simply missed his knight' or 'because I was tired'? Chess seems to be unsuitable for introspection.
Stil, though, in each case, we're making a decision that satisfies some criteria. In the example of chess, these criteria might just be more explicit (e.g. winning the game as defined by the rules of chess), whereas for poetry we're trying to satisfy some function we ourselves don't quite understand (e.g. "find words that make me feel a certain way") that is more black-boxed.