“He hated games they made the world look too simple. Chess, in particular, had always annoyed him. It was the dumb way the pawns went off and slaughtered their fellow pawns while the king lounged about doing nothing. If only the pawns would've united ... the whole board could've been a republic in about a dozen moves.”
Three-player chess. Black and white play as normal. Red starts with two pawns in the middle. Red's pawns move one space orthogonally, capture one space diagonally. If red would capture a pawn, that pawn instead becomes red. If a red pawn would capture a knight, bishop, rook, or queen, red's pawn becomes a piece of that type. Red loses if they run out of stuff. If black or white loses, their pieces stay on the board and stop making moves.
― Terry Pratchett, Thud!
Three-player chess. Black and white play as normal. Red starts with two pawns in the middle. Red's pawns move one space orthogonally, capture one space diagonally. If red would capture a pawn, that pawn instead becomes red. If a red pawn would capture a knight, bishop, rook, or queen, red's pawn becomes a piece of that type. Red loses if they run out of stuff. If black or white loses, their pieces stay on the board and stop making moves.