Kiddush on Yom Kippur

        Kiddush on Yom Kippur

                              (especially this year)

Kiddush on Friday night is דאורייתא.

Mitzvos דאורייתא requires כוונה.

Kiddush on Yom Kippur is a מחלוקת between R.Akiva

Eiger who holds it is not דאורייתא unless it falls on a 

Shabbos and the Chasam Sofer (Hagahos O.Ch.271) who 

holds it is a Mitzvah דאורייתא to make Kiddush every 

Yom Kippur. (even weekday)

This year even according to Reb Akiva Eiger, when Davening the

Shmonah Esrei on Yom Kippur night you are required to

 have in mind when saying

ברוך – מקדש ישראל ויום הכפורים

to be Mekayam  (Yotzei)  Mitzvahs Kiddush.

Mori V'Rabi Harav Hagaon R. Shlomo Miller Shlita, said

Those who are not aware of this Halacha that מקדש ישראל ויום הכפורים

is the Kiddush of Yom Kippur will not be Yotzei even according to Reb Akiva Eiger 

in a weekday Yom Kippur since he is a מתעסק ( worse than no Kavanah)

Did You Know (167)

The Brisker Rav zt"l holds one who wants to 

be Yotzei daytime Kiddush from another person  

must drink from the wine, otherwise he is not Yotzei Kiddush.

Since the daytime Kiddush consists of only the Bracha

of Pri Hagafen, (the Pesukim we say before are not really

part of Kiddush) therefore by merely answering Amen

on the Pri Hagafen which is done during the weekdays as

well, he is not Yotzei.

Harav Yosef S. Elyashiv zt"l argues and holds one is Yotzei

Bedieved even when not drinking from the wine.