Checkerboard and Checkers

This thing is a checkerboard. I have also included checkers, and arranged them so that you can print half red and half black. If you don't know how to play checkers,
http://boardgames.about.com/cs/checkersdraughts/ht/play_checkers.htm
has all the rules. Also, please look at the instructions to find out how to print this thing. This thing was made in OpenSCAD with the following code:
Board:
cube([42,42,1]);
translate([1,1,1])cube([5,5,1]);
translate([11,1,1])cube([5,5,1]);
translate([21,1,1])cube([5,5,1]);
translate([31,1,1])cube([5,5,1]);
translate([1,11,1])cube([5,5,1]);
translate([11,11,1])cube([5,5,1]);
translate([21,11,1])cube([5,5,1]);
translate([31,11,1])cube([5,5,1]);
translate([1,21,1])cube([5,5,1]);
translate([11,21,1])cube([5,5,1]);
translate([21,21,1])cube([5,5,1]);
translate([31,21,1])cube([5,5,1]);
translate([1,31,1])cube([5,5,1]);
translate([11,31,1])cube([5,5,1]);
translate([21,31,1])cube([5,5,1]);
translate([31,31,1])cube([5,5,1])