Items Invented by Mark Thompson
Cuarenta. Played only of the light-colored squares of a 9 by 9 board. By Mark Thompson.
- Give & Take Chess. After setting up pieces, players must capture each turn. (8x8, Cells: 64) By Mark Thompson.
- Tetrahedral Chess. Three dimensional variant with board in form of tetrahedron. (7x(), Cells: 84) By Mark Thompson.
Trampoline Chess. Each player has a Trampoline that allows friendly pieces to make a second move. (8x8, Cells: 64) By Mark Thompson.
Cuarenta 
. Played only of the light-colored squares of a 9 by 9 board. By Mark Thompson.
- Tetrahedral Chess . 3d chess variant with board in form of tetrahedron. By Mark Thompson.
- Trampoline Chess . Each player has a Trampoline that allows friendly pieces to make a second move. By Mark Thompson.