Object: capture your opponent's King.
 
A piece is allowed to make two moves per turn. Depending on the variant, the second partial move is only allowed under certain conditions:
 
Variant 1: Second partial move always allowed.
Variant 2: Second partial move only when first move was a capture.
Variant 3: Second partial move only when first move was not a capture.
Variant 4: Second partial move only when second move is a capture.
Variant 5: Second partial move only when second move is not a capture.
Variant 6: Second partial move only when both moves are captures.
Variant 7: Second partial move only when neither move is a capture.
 
Variant 8: Second partial move only when into the same direction.
Variant 9: Second partial move only when not into the same direction.
 
There is no double move when castling or promoting.
In the first partial move the king may move into check.
 
Whereas the first variant is an obvious extension of standard chess, at least some of the other variants seem to be new.
 
 
For more freeware as well as real puzzles and games see my home page http://karl.kiwi.gen.nz.