The game starts in normal setup but every piece is gray except for the king, the queen and the pawns infront of them(which are coloured black and white as normally).all pawns on the second rank move towards rank 8 ,all on the seventh towards rank 1(as normally)
Now comes the rule that changes everything:both players are allowed to move grey pieces and by doing so you paint this piece in your colour,so you gain control of it.Grey pieces can't capture other grey pieces.
