Ayatollah Khomeini referred to Jame'ol Madarek for his Fatwa, and chess was considered sound (Halal) to play after more than 1,000 years among Shiat Muslims. There are other books claimed to be written by Ayatollah Haj Seyyed Ahmad Khansari; however, these were published after his death against his will. Therefore, some believe that these books have been modified from their original versions.
Ayatollah Khomeini relied on Jame'ol Madarek for his Fatwa, and chess was deemed acceptable (Halal) to play after over 1,000 years among Shiat Muslims.  There are other books claimed to be written by Ayatollah Haj Seyyed Ahmad Khansari, but these were published after his death without his consent, prompting some to suspect they may have been altered from their original versions.