Take the middle matzah and break it into two, one piece larger than the other.

The larger piece is set aside to serve as Afikoman (Dessert for the meal to follow). This is traditionally hidden, by the leader of the Seder while others who will later try to find it, hide their eyes. The Matzah striped and pierced each Passover feast is broken and hidden away and returns at the Third Cup as the Book and Blood of Covenant at Sinai: in the order of the Seder

He (Moses) took the Book of the Covenant and read it in the earshot of the people, and they said., "Everything that HASHEM has said, we will do and we will obey! Moses took the blood and threw it upon the people, and he said, "Behold the Blood of the Covenant that Hashem sealed with you concerning all these matters." (Exodus 24:7-8)

The smaller piece is put back, between the two unbroken matzot. This smaller piece, along with the top matzah is what will be used for the “Motzi-Matzah” and “Korech” later in the seder.

haggadah Section: Yachatz