Chess III A modern variant of Four-handed Chess, where every player plays for himself, i.e., no teams are formed, was described by Daniel Loeb. GenCon is the name of a gaming convention. Since then I've been looking for it. Board is like this Each player sets up normally in his 2x8 sections. Squares such as C2,B3 are NOT considered diagonally adjacent.
Pawns move away from their starting sides and promote when they reach the opposite end.
If a player A takes player B's king. The 2x8 section of board belonging to B is removed. All pieces on it are removed. Player A can replace any missing pieces in a starting square of his for such a piece. B's remaining pieces remain on the board as inert obstacles.