第502局 兵马徒劳
1 手
兵马徒劳 — "Horse and Foot Labour in Vain" Problem 502 of 適情雅趣, volume 6 (卷六). The source gives its answer in prose rather than as a line, which is what a draw study usually needs: 「炮保和局」 「炮拦马，相走闲着，马卒徒劳，无法取胜。」 Transcribed from http://www.dpxq.com/hldcg/search/view_u_43219.html