blocks with brown edges cannot be removed or passed by white or black edged blocks, UNLESS there is a color inside the brown edged block.
red edged blocks cannot be passed by the blocks edged with the color of the inside of the block (example: red edged block with black inside cannot be hit by black blocks, it will result in losing, HOWEVER, white blocks would be able to go thru).
white and black edged blocks that you DONT control, can only be passed by the opposite color (i.e white edged blocks can only be passed by black edged blocks)
