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- King-on-Queen foundation completion (the end-game move had no test) - King wrong-suit rejected on completed foundation - Ace-on-Two valid placement (Ace.value()+1 == Two.value(), different color) - Same-rank different-color invalid (rank difference is 0, not 1) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>