Human beings have played games since the dawn of civilization, and none of them epitomize classic gameplay as much as chess and backgammon. The true origins of both are long gone, but the former can trace its lineage back nearly 1,500 years, while the latter was played in an earlier form over five millennia ago. Thanks to the digital age, you can now slip both games in your pocket; too bad you also can't get in a time machine and awe a few ancient soldiers sitting around on guard duty.