Master Chess Triple Game . Two players play on three boards connected by corridors. Matrix Chess Notation . A proposal for a new notation of chess. Mecklenberg Chess .
Pawns can promote on the sixth row.
Played on 6 boards arranged in a 2 by 3 grid. Line up the boards with the same orientation for their coordinates and so that the squares all mesh together into one giant board of 384 squares. By Fred Lange. Variant on 9 by 9 board with 9 different pieces and castle square that must be occupied. By C. George Boeree.