Sound · Joining Forces Against the Yellow Turbans

What the solver found: an exact audit of the classical manuals

11 moves

Joining Forces Against the Yellow Turbans (会剿黄巾) — Deep as the Sea (渊深海阔, 1808), no. 156 The book claims mate in 6 by continuous checks. Exhaustive search agrees: one key, no second solution after any defence, and nothing faster. The mainline is the book’s solution; a branch, w…