RULES:White's major pieces are set up on the first and second ranks as shown in the diagram. White's pawns are set up on the third rank. The white rooks alone are positioned on the first rank, which makes it easier for them to activate earlier in the game since they are not blocked by the other pieces as they are in standard chess. The black rooks are placed the same, for the same advantage. Black's major pieces are set up on the ninth and tenth ranks, and Black's pawns are set up on the eighth rank.
A white pawn may elect to either promote or remain a pawn upon reaching the eighth and ninth ranks, but must promote upon reaching the tenth rank. Unlike standard chess, a pawn may be promoted only to a previously captured piece of the same color. (So, it is illegal for either side to have two queens, or two marshalls, or three rooks, etc.) If no captured piece is available for promoting a white pawn about to reach the tenth rank, the pawn must stay on the ninth rank, but it can still give check.
Similarly, a black pawn promotes optionally upon reaching the third and second ranks, but must promote in order to move to the first rank. It can still give check from the second rank to a white king on the first rank, even if it can't yet legally move to the first rank.
As in standard chess, pawns can move one or two squares on their first move, and they may also capture en passant.
As in chess, checkmate is a win and stalemate is a draw. But there is no castling in Grand chess
by six times U.S. champion Pal Benkö