Author: Vladimir Portugalov
Divide the grid along the grid lines into L-shaped figures. Each figure should contain exactly one circle and it should be placed in the bending cell. The figure should have equal legs if it contains a black circle and it should have unequal legs if it contains a white circle.
Grid control: To draw a cut click at the cell edge or move mouse along the line holding the button. You can also connect the cells which belong to the same area with auxiliary line. More details about grid control are at the help page.