Checkers In Half Life 1

I have put together this little HL1 map that allow two players to play checkers in space. The players can push each individual counter around the board. Standard checkers rules apply. Oh, and if you get bored, rumour has it that there are some guns stashed away somewhere. All relevant files are in the zip available down below. I don't mind it if you make you own version but it would be nice if you could leave a link to this site somewhere.