[Avodah] Eating Two Kezeisim of Matza for Motzi-Matza.

[R Davidovich]

I brought this up on a Hirhurim comment thread, but was ignored.  So let me
bring it up here.

Motzi-Matza. The practice of eating two k'zeisim is cited in shulchan Aruch
O"C 475, even though it is only quoted by the Rosh, (and then of course the
Tur) and not the Rambam or Rif, who say that one k'zayis is enough.  At
first and second and third glance, this seems to be based on the perceived
need to have one kzayis from the top matza and one kzayis from the middle
matza.  "Ein Osin Mizvos Chavilos Chavilos" seems to mean we don't bundle
mitzvos together, but take each one separately.

What are the two mitzvos under discussion?  What is the Mitzvah of "Motzi"?
Eating lechem at a yom-Tov meal, I presume.  This is considered a separate
mitzvah from the one to eat a kzayis of matza on Leil Tes-Vov?  The Biyur
Halacha doesn't understand the need for two kzeisim and all but rejects the
Shulchan Aruch (and Rosh's) approach, commenting that it is cited nowhere in
Shas or the other main rishonim.

Since this practice is associated with the fact that the bracha is made over
two matzos, is there any reason for a person who is not eating from the
matzos located on the seder plate to eat two k'zeisim? After all, this
person is not eating one k'zayis from the top matza and one k'zayis from the
middle matza anyway. He's eating from the box matzos that the host is
passing around.

Raffy

PS As an aside, would the Shulchan's Oruch's preference for swallowing both
kezeisim simultaneously disprove the Noda Beyehudah and Chazon Ish's shiurim
right off the bat?!

-- 
RD
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