Well, it would work, assuming you know how to play chess, like you pointed out. And you'd be amazed how dumb people really are. (like students who think the Waffen SS was one of the largest resistance groups in WWII, or, closer to The Escapist, the fortunes movies like Twilight and Transformers make) My point is, you can't rely blind on these systems to work because it involves a skill other then being able to read and write. Plus, like you said, computers are becoming very good at chess, so they could solve them as well.