Reference

"Shogi Basic Strategy" : Ibisya, Taku Morishita, Nihon Shogi Rennmei

"Latest Bogin sennpou", Teruichi Aono, Sogensha

"Bogin sennpou", Kazuo Ishida, Sogensha

"Easy, Useful Quick effect ! Tesuji of Yagura", Yuki Iizuka, Mainichi Communications