1991 Criminal Commutation Act Article 7

Offenders, who commit offenses that are not to be commuted as stipulated in Article 3 and are not discovered by the authorities but surrender oneself to the authorities to receive judgment within three months of the enactment of this Act, shall receive commutation in accordance with the provision stipulated in Article 2, Paragraph 1, Subparagraph 1, Category A of this Act.
中文原文 中華民國八十年罪犯減刑條例第7條
對於本條例第三條所定未發覺之罪,於本條例施行之日起三個月內自首而受裁判者,依本條例第二條第一項第一款甲類規定予以減刑。

English translation for reference only; the Chinese text prevails. Not legal advice.