The Mishna Berurah gives us some of the history and of the fourth Bracha of Birkat HaMazon and how that impacts the set up of the Bracha

We begin to discuss the text of the fourth Bracha of Birkat HaMazon.

We discuss a situation where a meal on a day like Rosh Chodesh/Yom Tov or Chanukah/Purim on a Friday extends in to Shabbat.

We discuss a situation where a person Davens Maariv or something along those lines before saying Birkat HaMazon on their meal that started at the end of Shabbat and continued into Rosh Chodesh.

We discuss different Shitot of various Poskim regarding what to do when one eats Shalosh Shudos and their meal extends into Motzaei Shabbat which is Rosh Chodesh.

We learn another possible opinion regarding a Birkat HaMazon for a Shalosh Shudos that extended into Motzaei Shabbat which is Rosh Chodesh.

We discuss a suggestion that isn't made by the Mishna Berurah when one eats on a Shabbos afternoon and continues to consume bread into the next night which is Rosh Chodesh.

We continue our discussion of a person who eats a meal on Shabbat and continues into the night which happens to be Rosh Chodesh.

We discuss a person who begins a meal on Shabbat and it extends until Chanukah or Purim.

We discuss a person who begins a meal on Shabbat and it extends into Rosh Chodesh.