Ok. I changed my mind, let's do that.
All we need is an answer bots can't answer. something as simple as "what's the game called? Hint: B.....M....r" would probably do.
Actually, we already had that question, without the hint, and the bots were still getting in. Less than they have been since the server move, though, so I assume you didn't put it back in on the new version.