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Shape Bank

lead came this step 1 clue 2 clues 3 clues what-if

Allowed piece shapes

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Deduction log

1 clue settles an edge on its own. 2 clues means two clues read together — every arrangement satisfying both agrees on that edge. 3 clues means three at once. Only when all of that is exhausted does it fall back to what-if: assume an edge, follow it until a rule breaks, take the other way. The tiers are tried in order, so a board never uses a what-if it did not need.