Birkat HaMazon: Women's Mezuman and Minyan

Women (even if 10 or more) do not make a minyan, only a mezuman.  So do not say the birkat ha'mazon's minyan introduction but simply say the mezuman introduction if:
  • 10 or more women ate together, without men present;
  • At least two women washed, said ha'motzi, and ate bread; AND
  • At least one more woman ate some type of food.
Note Women are never required to make a mezuman. So when three women are eating together and no men are present, they may say birkat ha'mazon as a mezuman but they are not required to do so.