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Micro-Max (https://home.hccnet.nl/h.g.muller/max-src2.html) is a chess engine written in C (2000 characters!) and has an ELO of about 1900 and plays only legal moves.

Are you comparing C and sed as similar platforms for developing a chess engine? :)

I would be kind of shocked if you can't compile C to an unholy sed program.