513. Besieged but Hard to Break

Elegant Pastime Manual, Vol. 6: 83 classical compositions

7 moves

攻围难克 — "Besieged but Hard to Break" Problem 513 of 適情雅趣, volume 6 (卷六). Transcribed from http://www.dpxq.com/hldcg/search/view_u_43230.html