move. if they decide to play a normal chess move, they choose this move and play it.
b) if the power is black and if the blacks have the move, the blacks decide if they are going to play the zero move or a normal chess move. if they decide to play a normal chess move, they choose this move and play it.
c) if the power is white and if the blacks have the move, the whites decide if the blacks are going to play the zero move or a normal chess move. according to this choice, the blacks will pass its turn or will choose their move among the possible 