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.
(kaŝi) Se vi volas ludi kontraŭ ludanto de simila nivelo, vi povas difini intervalon de BKR ĉe invito al nova ludo. Tiukaze neniu kun BKR ekster tiu intervalo povos vidi/akcepti ĝin, (Katechka) (Montri ĉiujn konsilojn)