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Rules:
Pilgrim - king that cannot capture pieces (from Monkey King chess).
Rook, Knight, Monkey (ferz) moves as in Shatranj.
Picket moves as a modern bishop, except that it always must move at least
two squares. So it's a bishop minus ferz. Can be blocked at ferz-distance
(cannot leap). (from Tamerlane chess).

Promotion rules mainly from Chaturanga with changes. 
Pawns can promote when they arrive at the last rank of the board, but only
to the type of piece that was on the promotion-square in the opening setup,
e.g., a white pawn that moves to b8 can only promote to a knight. Doesn't
matter the player already lost a piece of this type or not.

King pawn may promote only in same case... if pawn stands on e7(e2) and
Pilgrim is mated. In this case player places pawn on e8(e1) and pawn
promotes to new Pilgrim.

Other rules as in Shatranj exept stalemate is a draw.

http://play.chessvariants.org/pbm/play.php?game%3DMidnight+Shatranj%26settings%3Ddefault02