What is "trishogi"

Trishogi is a shogi variant for two players created by George R. Dekle, Sr. in 1987. The gameboard comprises 9×10 interlocking triangular cells. The game is in all respects the same as shogi, except that piece moves have been transfigured for the triangular board-cell geometry.

Trishogi was included in World Game Review No. 10 edited by Michael Keller.