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Gustavian Adjutant ChessA game information page
. Standard chess with empty extra corner squares and extended castling (with zrf).[All Comments] [Add Comment or Rating]
M Winther wrote on 2008-12-03 UTC
I haven't tested this extensively, but it has some interesting properties.
A weakness on the long diagonal is now much less
dangerous. A party could even exchange his fianchetto king's bishop
against a knight and escape with the king to the extra square, and
even if the opponent has a bishop and a queen on the long diagonal,
the king would be protected (provided that the first rank is
protected). On the other hand, a weakness along the diagonal to h7 and
h2, down to the extra square, is now more dangerous than before.

Checkmate must now be more common because the strategy can 
be less cautious. It's now much more likely that the
g-pawn will move two steps. After all, in Fide-chess, this move is
generally catastrophic, although one cannot resist doing it in blitz
games. This has enormous strategical consequences, and bloody battles
on the king's wing will ensue. The extra square could have some
significance to the knight, also, as a maneuver square.

I have uploaded an update to the Adjutant Chess program which plays
better. I also added variants with Chancellor and Archbishop in the extra
corners. I am not fond of these pieces (the Amazon is better), but I 
introduce them so one can compare the virtues of the Gustavian board 
with Capablanca's Chess and Seirawan Chess.