switch grey and white? does not make sense.
If you move the black, then what is the color of the original position of the black?
If the black was moved to the white/grey position, then what color was this new position?
switch grey and white? does not make sense.
If you move the black, then what is the color of the original position of the black?
If the black was moved to the white/grey position, then what color was this new position?