Argh, I didn't even think about the "it should be simple to be visibly cooperating" bit. Trying to do static analysis on Scheme (with its conds and cases and quasiquotes) is enough to make my program complicated. Maybe I should just submit a MimicBot instead.

Does MimicBot run the opponent and then return the same result? If so then I suggest a timeout/defect feature. Any bot that fails against itself has problems!

Are there going to be CooperateBots in the competition? If that is a possibility then consider a simple tweak "If my opponent does not make use of its opponent variable then defect else Mimic". (Failing against unobfuscated CooperateBot is at least as embarrassing as failing against self.)

Btw, just in case anyone was thinking of doing such a thing after the declarations so far: If you do any redefining of syntax, I'm defecting on you.

Anyone who tries that must and doesn't expect defection must seriously hold the opposition in contempt!