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Anything by John Carmack. (DOOM's open source release, for example)

I'd second that. Some years ago I had a look at the quake 3 bots code, which I think were also written by John Carmack. The code was amazingly intuitive.

The Q3 bot AI was written by this man https://doomwiki.org/wiki/J.M.P_van_Waveren_(MrElusive)

Carmack said that he was "the best developer I ever worked with"

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