Sol.3 : Discovered by 進藤欣也 (Yoshiya Shindo) (May 1997). Sol.1,2,4 : Discovered by 石野恵一郎 (ISHINO Keiichiro) (2000). Sol.5-11 : Discovered by 白川俊博 (Toshihiro Shirakawa) (2013).
11+ solutions.