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.
Finally finished it. Had to start over after my first approach.
Tried to solve it like human with many rules and stuff ending up with 2300 lines of code ….
Nearly gave up and couldn’t finish the cat. So i started again after asking someone else how it should be done and wrote a complete different approach and made it with 300 lines of code … crazy challenge. thx for that