Items Invented by Fredrik Ekman
Thuria Jetan. Jetan variant played on standard chessboard. (8x8, Cells: 64) By Fredrik Ekman.
Jetan: The Martian Chess of Edgar Rice Burroughs. Book about jetan. (10x10, Cells: 100) By Fredrik Ekman.
Exploring Jetan. Analysis and extended rules for Edgar Rice Burroughs' "Martian chess" jetan. By Fredrik Ekman.