《北史·列传·卷十三》
古弼入朝想向皇帝陈奏，皇帝正和给事中刘树下棋，心不在听政事上。
弼入欲陈奏，遇帝与给事中刘树棋，志不听事。
Gubi wanted to go to the court to report to the emperor, but the emperor was playing chess with Liu Shu, the Zhongshicheng, and he was absent-minded and unable to listen to political affairs.