Checkerboard

We play chess on a checkerboard.

We play chess with a checkerboard.

The checkerboard with 100 squares used in checkers has its black squares numbered 1 to 50, from right to left, on the black side, so that they initially occupy the four rows of squares identified by the numbers 1 to 20, while the white pieces stand on the four rows of squares identified by the numbers 31 to 50.

The checkerboard tiling and shopworn 1950s decor in Dr. David Mushabac's dental office seem a bit old fashioned, but all the necessities are there: sky-blue swivel chair with headrest, porcelain basin, cotton swabs, and row upon row of sterile metal instruments.