Sound · Eyes on the Flooding Current

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

5 moves

Eyes on the Flooding Current (目视横流) — Elegant Pastime Manual (適情雅趣, 1570), no. 13 The book claims mate in 3 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, where th…