After the kaisei (end of a seichu period), the shuso, as a representative of the chief priest, must express his own spiritual state by answering questions related to Dharma from the other ascetic monks.
解制（制中期間の終了）後、首座は住職の代理として他の修行僧達を相手に法問答を行い自らの境地を示さなければならない。