Corrupt record · Swiftly Slaying Wen Chou (what the solver found)

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

8 moves

Swiftly Slaying Wen Chou (疾诛文丑) — Deep as the Sea (渊深海阔, 1808), no. 217 The book’s mate in five fails at Black’s first reply, and Black is winning the position, so the record cannot be the composition. The mainline is the book’s solution; a branch, where there is one, is what t…

At Black's move 4 the book gives Ae9, which loses. Re10 instead, and Red has no mate in the printed length: exhaustive search, not something the board shows in one move. Black is winning in this position, which is why the record, not the composition, is the thing at fault.