Spinach Chess . Right to make powerfull move alternates between players in variant with two kings. By Hans Bodlaender. Two players fight with three armies on board formed by 39 triangles. 8x8 Reversible Stairs-Chess .
Chessboard looks like stairs.
The Royal Standard . Pieces can only move when near a standard-bearer piece on board with 38 squares. Star Chess . 3d-chess variant on two round levels. Star Chess .