4.2. Stack to Stack Moves
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To test the initial versions I generated a 1000 test boards.
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I noticed some of them were not solvable.
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I played some of them manually, and noticed they were solvable using
a move that I missed.
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The latter was a meta-move that placed a card on a parent card on the
same stack
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By implementing it, all of my boards turned out to be solvable.
Written by Shlomi Fish