The curves that appear in the robot's way were boldened, to ensure its stay on the good direction.Each of the ends of the road contains a turning-around point.The robot knows that these lines have the purpose of informing about the change of square because of the presence of white.The light sensor does not precisely distinguish the colors, that is why we have again chosen to use white and black.The area between the two lines, bounded by two strips placed on the border between two neighbour squares.The robot always remains on the surface between the two lines.A white line and a blacj line, which help the robot in his movement across the board.This strategy can be applied in the Tic-Tac-Toe game, where at each step the first player will try to maximize his chances of winning, whereas the second player will attempt to minimize the first player's chances of winning.Is a method in decision theory used for minimizing the maximum possible loss.2 engines are used for changing position and the third one is used for arms movement.Can use all 4 sensors in order to fulfill its goals.