It says on http://www.dailyhalacha.com/m/halacha.aspx?id=2853 that "Several Halachic authorities, including the Aruch Ha’shulhan (Rav Yechiel Michel Epstein of Nevarduk, 1829-1908) and Hacham Bension Abba Shaul (Israel, 1923-1998), understood the Bet Yosef (Orah Haim 271) as indicating that the obligation of Kiddush is fulfilled even if the wine is not drunk. Although the "Misva Min Ha’mubhar" – the highest standard of performing the Misva – requires drinking a "Melo Lugmav" of wine, the basic obligation is fulfilled even if nobody drinks." Can someone please tell me where exactly in the Aruch HaShulchan he says that drinking a melo lugmav is only the "mitzva min hamuvchar" and that "the basic obligation of Kiddush is fulfilled even if the wine is not drunk"?
אלא וודאי דזהו דעתו של רבינו הב"י - דבלא טעימה אין המצוה כתקונה, אבל יצא ידי קידוש.
Clearly, then, this is the Beis Yosef's opinion: that without tasting [from the wine] the mitzvah hasn't been fulfilled in the optimal manner, but he has fulfilled his obligation of kiddush.