Chess variants on a 10x10 board, in particular Grand Chess.
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Walter Montego: About Pawn promotion, I have another suggestion than yours: A Pawn is promoted to a Gold General (piece borrowed from Shogi, the Japanese Chess). When captured it returns to a Pawn. No doubt, this will boost the game, due to this terrible threat.
I have not yet an opinion if a promotion could be better since the 5th row in place of the 8th.