>>590
neat, however these custom captchas are still liable to just being knowledge checks. If you get a guy who just does OOP to answer questions about functional programming, he's going to be filtered despite being compentent. Context and instruction on how to solve the problems is necessary to use them in any way as an assessment of capability. Being thrown obscure set-theory notation symbols is far from ideal.

Also, for the more general boards, maybe it'd be a good idea to have general questions. Maybe something like a ravien matricies quiz to ensure that someone is big brained enough to post would be good.

Sooner or later you're going to have to implement a proper way to generate the questions. I'd suggest liberating the source code to this captcha mechanism you have so users can contibute to it. If this isn't done, then brute force methods to "solving" problems will just be used.