Invented by Helge E. de Vasa in 1953 and first published in Joseph Boyer's Nouveaux Jeux d'Echecs Non-orthodoxes (Paris, 1954).*
*
The rhombus-shaped board comprises 81 cells with initial setup as shown, in the revised form of the game.*
*
Rules for piece movement are the same as Gliński's variant, except for the pawns.