Other users are correct -- this can easily be defeated if it gets popular enough. The problem is an easy 1/4 chance to get it right, and the bot could just try again and again as suggested. Even using different IPs/etc. I loved this idea, but unfortunately I have to go with the other method (asking questions) which is more time-consuming to make, but are unique to each forum and require real user input (that has infinite possibilities).
It will help people until there is a crack, so thanks for doing it.
-vissa
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