positive, negative.


top-left-square: x,o,b.
top-middle-square: x,o,b.
top-right-square: x,o,b.
middle-left-square: x,o,b.
middle-middle-square: x,o,b.
middle-right-square: x,o,b.
bottom-left-square: x,o,b.
bottom-middle-square: x,o,b.
bottom-right-square: x,o,b.