First of all i think it’s a ??? that r kalman epstein wasn’t listed as being one who wears tcheiles.
second of all the mishna brura paskens against the ???”? that is brought as a raaya to r chaim’s yesod in hilchos birkas hamazon if one only knows the first bracha, should he say it.
Acc. to r chaim since it is a safek whether ????? ?????? ?? ?? ?? and even after he says that one bracha he still is not finished, one does not need to, but the ???”? paskens that one should cuz of safek deoraisa lchumra
I am so happy that a lively debate about the heiligeh mitzva is finally being discussed at length on yeshiva world. this topic was neglected for so long.