The Blue Cliff Record (Chinese: 碧巖錄 Bìyán Lù; Japanese: 碧巌録 Hekiganroku) is a collection of 100 Chan (Zen) Buddhist koans originally compiled in Song China in 1125, during the reign of Emperor Huizong, and then expanded into its present form with annotations and commentary by Chan master Yuanwu Keqin (1063–1135; Japanese: Engo).