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Sure it is allowed. The more bots the merrier. I'm fixing the link right now

(links fixed)

It's just my personal opinion, but i think it would save you a lot of time if you would ask everybody submit bots directly to the repo in PR's. There might be even minimal automated testing performed (to ensure it doesn't crash from syntax error, implements required methods and so on). This way you'll need to and gather it all together by hand, which might be a headache if many people participate (which i hope will be the case).

You're completely right, and you're very welcome to submit your answers as PRs. Still, submitting as comment is easier for people who are not familiar with github, and also easier to comment and vote on. Choose your preferred method
Gist may not be optimal in this aspect

Here's my OffendablePlayer, that's gonna be utterly destroyed by @amosbastian's SelfishPlayer unless we will get some more cooperative players in :) https://gist.github.com/Scorpil/0fb5bf9ffe512ccc63ca0f3a6229ea56

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