David Paulowich's proposal to play chancellor chess with chancellors and queens in the corner on 8 by 8 board. New Chancellor chess variant . A 'color-attribute' based hexagonal chess variant. By Kumar Yelubandi. Only kings and pawns.
Pawns can move backwards.
The first known variant of chess. Chaturanga for four players . The first known multiplayer variant of chess. Checkers chess . Pieces move initially only forwards.