cool captcha system, but seems to be more of a knowledge check than an intelligence check. Maybe that's intentional, but it will preclude some good thinkers from participating in discussion. 

I bring this up because programmers (such as myself) may get filtered syntactically by math, but still would be able to provide a solution if the content itself was presented in a better format. Maybe that's the point since this is a imageboard for math autists, but this holds potential to be an aristocrat/elitist's imageboard if it was more syntactically neutral, but hey, that's just me.