Added Interactive Diagram where you can play against a bot:
https://www.chessvariants.com/rules/grandtriplechess
Grand Triple Chess
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Grand Triple Chess is played on an 16 x 24 board (i.e. six boards) with 3 sets of pieces.
The idea for the origin of this chess variant can be found here Grand Triple Chess
Rules on chessvariants.com Grand Triple Chess
You can play Grand Triple Chess here https://www.evochess.com
Grand Triple Chess
Grand Triple Chess is played on an 16 x 24 board (i.e. six boards) with 3 sets of pieces. Two Queens are substituted for two Kings though.
The board doubles in height and triples in width, and the game begins with one king, six knights, six bishops, six rooks, 24 pawns and five queens on each side.
The moves of the pieces remain the same as in Standard Chess.
Pawns promote as normal when they reach the 12th rank (5th rank for Black). Therefore, Pawns advance as far as they would on a regular board before promotion.
There is no castling.
En passant rules, Check and Checkmate rules, Stalemate and Draw conditions, Winning conditions remain the same as in Standard Chess.