Full Double Chess uses the following combination pieces not used in
International Chess: the Amazon (a combined Queen
and Knight), the Chancellor (a
combined Rook and Knight) and the Cardinal (a
combined Bishop and Knight).
Rules
The game is played by rules of International
Chess with the exception of the board and setup, and following
rules:
The object of this game is to mate or capture both of your opponent's
Kings. When a player has two Kings on the board, either may be moved
and captured like a normal piece, including being moved to attacked
squares or being left under attack. Once a player is reduced to a
single King, the usual rules of check, checkmate and stalemate apply
to their remaining King.
Either King may castle with either Rook or either Chancellor, as long
as none of the pieces involved have moved yet. The King moves up to
(but not on) the piece castled with, and the piece castled with leaps
over the King to land on the King's far side. Thus the white Kings
may castle to b1, e1, l1 or o1, and the
Black Kings may castle to b8, e8, l8 or
o8. Even if both of a player's Kings are still on the board,
they may not castle if attacked or through or to attacked squares.
A Pawn reaching the last rank must promote to moving player's choice
of an Amazon, Queen, Cardinal, Chancellor, Rook, Knight or Bishop.
Variant
Allow Kings to castle when attacked or through or to attacked squares
when a player still has two of them on the board.
Computer Play
An implementation of Full Double Chess has been written for Zillions of Games. You
can download it here:
