[Avodah] When Shabbos is Motzaei Rosh Chodesh

[Akiva Blum]

On Mon, Jun 18, 2018 at 6:17 PM Akiva Miller wrote:

> Let's consider someone who begins Shabbos early, and arrives home and
> begins his seudah before sunset. He will probably eat the bulk of his meal
> before shkia or tzeis, perhaps even the *entire* meal...
> In such a situation, what additions does one add to Birkas Hamazon? On a
> regular Shabbos, of course one would include Retzeh. But when straddling
> Rosh Chodesh and Shabbos, would one say Retzeh or Yaaleh V'yavo or both?

Please see the Mishna Berurah 188:32 where he quotes the Acharonim that if
during Seuda Shelishis someone davened maariv, he can no longer say retzei.
It seems that the same should apply erev shabbos, after one has davened
maariv, he can no longer say yaaleh veyovoh.

Akiva Blum