401. Hidden Birds Gather at the Steps
Elegant Pastime Manual, Vol. 5: 90 classical compositions
17 moves
幽鸟攒阶 — "Hidden Birds Gather at the Steps" Problem 401 of 適情雅趣, volume 5 (卷五). Transcribed from http://www.dpxq.com/hldcg/search/view_u_43118.html