A chess variant for 4 players that I built over a weekend.
Click to begin the game.
Press 'R' to reset the board.
Press 'Z' to undo the last move.
The current player is denoted by the highlighting on the board.
Select a piece by clicking, then select one of the legal moves.
The turns rotate clockwise around the board.
Your King will be highlighted if they are in check.
Moves that place your King in check will show an X.
Pawns are promoted to Queens if they cross the entire board.