The basic dividing line is the Shulchan Aruch. But it’s not a hard-and-fast rule. The Shaagas Aryeh and Gra argue on Rishonim all the time. R’ Moshe says that in theory anyone can if they have a strong enough proof.
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The basic dividing line is the Shulchan Aruch. But it’s not a hard-and-fast rule. The Shaagas Aryeh and Gra argue on Rishonim all the time. R’ Moshe says that in theory anyone can if they have a strong enough proof.