Also according to its okugaki, the original based on which Yasukiwa transcribed was the one that was used when ABE no Yasuchika, who was called 'Sashinomiko' in the last days of the Heian period, instructed "Senji ryakketsu" to his son ABE no Chikanaga.
同じく奥書によれば、泰際が書写を行った原本は、平安時代末期のに、「指御子」(さしのみこ)と呼ばれた安倍泰親(あべやすちか)から、子息の安倍親長(あべちかなが)へ、『占事略决』が伝授された時のものである。