We have a captcha, its just been publicly cracked obviously.
The fundamental problem is we are running an old version of phpbb. We can't upgrade however as the forum is made to specifically work with a set of alpha software which is very fiddly, including my own code for how the mafia game works. Thus the only way to solve this would be to find a captcha mod which is modern and works with this old forum - something which is basically impossible as all modern captcha mods for phpbb are made to work with the latest copy.
So ways of dealing with bots are:
1. Someone deleting them (current plan)
2. Close registration
3. Have registration which requires admin approval (easy to do, just check a button, but then each needs to be scanned individually and it can be hard to tell who is real and who isn't, so lots of work)
4. Someone custom coding us a new captcha
5. Someone figuring out how to adapt a modern one to the old forum version
2009: Club Founder || Club President || Moderator Winter Game (Game 1)
2010: Executive for Documentation || Website and Game Engine Developer