The Rinzai Zen Sect has practiced this training method, which was developed during the Southern Sung dynasty in China, and which puts more emphasis on digging into and grasping koan than on increasing "Joriki" (the power that is inherent in 'zenjo' [dhyana, the quiet and balanced state of one's spirit and body that can be reached through concentrated zazen]).
南宋代に形成された、坐禅による定力の深まりを公案より軽視する、臨済宗の修行法。