Dual · One Torch for Epang Palace

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

13 moves

One Torch for Epang Palace (阿房一炬) — Deep as the Sea (渊深海阔, 1808), no. 69 At move 3 the book plays Rf9+; Rxg10+ mates just as fast. A dual. The mainline is the book’s solution; a branch, where there is one, is what the solver found. Record from dpxq.com.