You can get 100% without any backtracking.
Additional answer:
Try to solve grids manually, and recreate your human way of realizing that sometimes you’re sure that there’s a black and sometimes you’re sure that there’s a white.
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Thanks for the feedback, that was also my approach. After adding several extra rules, now I pass all tests.
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Well that NP-COM problem hit me hard AF. I’m trying BF and DAQ method.