9. Four-player chess variants
Chess variants for four players. They play in two teams: Yellow and Red play against Green and Blue. The teammates support each other, and attack the other team together.
The game ends when someone gets checkmated. Then the checkmater team wins and the other team loses.
More detailed rules: Four-player chess. These variants differ only in the board and the movement of the pieces. The general rules are the same.
Four-handed chessboard, teammates on opposite sides
Four-handed chessboard, teammates next to each other
Two connected normal chessboards
Four half-chessboards distorted and joined
Small circular ring
Big circular ring
Circular grid-based board
Four half-boards connected in every possible way