Xutang Zhiyu èÂÂå ÂæÂºæÂ (Japanese Kido Chigu, nickname Sokkà Â) (1185âÂÂ1269) was a Chinese Chan-monk who gave dharma-transmission to Nanpo Shà Âmyà  (1235âÂÂ1308), the founder of the Japanese Rinzai Zen à Âtà Âkan-lineage. His style of koan practice was admired and emulated by Hakuin Ekaku, and today it's the only existing line of dharma-transmission in Japanese Rinzai Zen.