Reply To: Classics and Beyond Pesach: great reason we have 4 cups by Seder

How about because
1) Kos al Kiddush haYom (like any other Yom Tov meal).
2)Kos on Hallel (Hallel is to be said on a kos. Hallel is divided, half before the meal and half after. So two kosos for Hallel.)
3)Kos al Birkas haMazon (like any other meal).
4)Kos al Hallel (Hallel is to be said on a kos. Hallel is divided, half before the meal and half after. So now we have another Kos on Hallel.)
1 + 1 + 1 + 1 = 4 (רב דוד הנשקה)