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Double Castling[Subject Thread] [Add Response]
Daniil Frolov wrote on Mon, Sep 21, 2015 08:46 AM UTC:
I thought to make a 20x20 game with the following first-line setup:

RNBRNBMCQAKQCMBNRBNR

With C being Cardinal, M being Marshal and A being Amazon (that is, four of
each basic pieces, two of each double compounds, and one tripple compound).

I did not finish this game because knight (and pieces with knight
component) required some augmentation: on such a huge board usual knight
would be pawn-like. But I had no idea, what augmentation. Making three
knight leaps in freely-bending directions (exactly three, to keep it
colourbound) would make it overly-strong. Limiting these bendings in some
way (for example, knight must keep his "long" (2 squares) direction, but
may change the "short" (1 square) direction freely) would be complicated
and artifical, and making him able to make one leap or three leaps in
straight knightrider direction would be not enough, and artifical as well.

Well, now back to the subject - my idea was that the King is able to castle
with any of four rooks, or with one of two Marshals (as you see in the
setup, their position are rook-like, while Queens' positions are
bishop-like). Of course, with only one of them, and only once per game.

Can't say for sure, but I don't think it's such a problem to uncover the
path to the external rook with non-external rook: with pawn multistep
augmentation, pawns can move quite far from the initial position, and a
non-external rook have two sideways directions after moving forward, rather
than one.