[Avodah] Zimun - 2 women with 1 man - permitted?

[Danny Schoemann]

RMB quoting RDS:
> : Reading between the lines, it seems like technically it should/could
> : be permitted, but the Minhag was to not do so.
>
> But this presumes a mixed-gender zimun is a matter of reshus. I had asked,
> in reply to the same post by RtSB that RDS is replying to, why this
> would be. Given that men and women have an equal chiyuv in bentching,

You may want to reassess that assertion. SA OC 186:1 states:
"Women are obligated in Birkat Hamazon and it's a Safek if that's a
Torah or a Rabbinic Chiyuv; the difference being if they can be Motzi
somebody who has a Torah obligation to Bentsch. (See 199 for their
obligation in Zimun)"

> why would the prohibition against breaking up a zimun apply any less
> when some of the mechuyavim are actually mechuyavos?

So you may have inadvertently found your answer.

- Danny (RDS)