Draw a closed loop on the board that goes through all the pieces; 3. If a white piece passes through a straight line, if a black piece passes through, it needs to turn 90 degrees. 4. The blank grid can be uncrossed, or it can be through by straight or turned. -------------- We appreciate any feedback you may have and will apply it to future updates and features. With your continued support we'll do our best to turn out quality Apps.