In the game of Squares and Circles, the players (you and your computer) start with a
sequence of shapes: some
circles and some squares. On each move a player selects two shapes. These two are replaced
with a single one according to the following rule:

Identical shapes are replaced with a square. Different shapes are replaced with a circle.

At the end of the game, when only one shape remains, you are a winner if the remaining
shape is a circle. Otherwise, your computer wins.

If the Random box is checked, computer on Reset will randomly select the length of the
sequence (from 3 to 20). When the box is unchecked, you may manually set the number of shapes.