Double chess

Double Chess is a chess variant invented in 1916 by Julian S. Grant Hayward. It is played on a board of twelve ranks by sixteen files, and each player commands two complete chess armies set up side by side along the long edge, so every side has two kings, two queens and the full complement of rooks, bishops, knights and pawns twice over. The rules follow ordinary chess with a few changes: a pawn may advance up to four squares on its first move, a king may castle only on its own half of the board, and a player wins by checkmating either of the opposing kings. The Ludii game portal classes it as a modern board game of the war, replacement and checkmate kind within the chess family. The rules were published in the January 1929 issue of British Chess Magazine, and the game drew some attention that year when the chess master Jose Raul Capablanca played a four game match of it against Geza Maroczy in London.