This year Tisha B'Av is on Thursday, and Friday morning the Rav's own daughter came and asked if she could go swimming. Normally the dinim of shavua shechal bo — no haircuts or shaving, no laundry, no bathing — stretch past the fast into Motzei Tisha B'Av until chatzos of the next day.

But this year that next day is the 10th of Av falling on Erev Shabbos, and l'kavod Shabbos there is room to be meikel, so every detail — from when the heter starts to whether it even has to be for Shabbos — has to be re-decided.

In this episode: - Kiddush Levana after Tisha B'Av — do you say it still fasting or only after eating, and does it need na'alayim or bigdei Shabbos to be royked?

Which dinim of shavua shechal bo carry over into Motzei Tisha B'Av until chatzos — istaper, kibbus, rachitzah, and even sewing and binyan?

Since the 10th is Erev Shabbos, when does the l'kavod Shabbos heter begin — miyad at night or only Friday morning — and is kibbus different from istaper and rachitzah?

May she actually go swimming Friday morning, even shelo l'kavod Shabbos?

Music and shehecheyanu on Motzei Tisha B'Av — permitted or not?

Sources: OC 426 (Rama; Mishnah Brurah s"k 11, Pri Megadim), Siddur HaYa'avetz, Zichnecha V'Yomru Lach (Rav Chaim Mintz b'shem Rav Moshe), Teshuvos v'Hanhagos (Rav Moshe Sternbach); OC 558 (Mechaber and Rama; Mishnah Brurah s"k 3, Magen Avraham b'shem Maharshal), Gemara Taanis 29a, Sha'arei Teshuvah, Eli Rabbah, Levush 551, Tosefos, Beis Yosef, takanas Ezra (Bava Kama 82), Shmiras Shabbos K'Hilchasa perek 42 (Rav Shlomo Zalman), Halichos Shlomo, Shmaita d'Moshe / Reshimas Aides (Rav Moshe), Rav Nissan Karelitz, Karlei Moed b'shem Rav Elyashiv; OC 551 se'if 17 (shehecheyanu), Sha'arei Teshuvah, Aish Avraham (Buchach) b'shem Kedushas Levi, Rav Shmuel Kamenetsky. Machshavah section: Gemara Taanis 29a (Rav Yochanan on Yud B'Av), Maharal, Netzach Yisroel perek 8, OC 559 se'if 4 (Tisha B'Av k'moed, "Karah alai moed"), Sfas Emes (agados al haYerushalmi, Taanis perek 4), Gemara Sanhedrin 97a with Rashi (Tanna d'vei Eliyahu).

This week a father came with a problem: his son's pidyon haben fell on Shabbos, which means the pidyon lands on the Sunday of the week of Tisha B'Av. But Sunday isn't yom lamed alef anymore — it's yom lamed beis, a pidyon haben shelo bizmano. Now the simcha and the mourning of shvua shechal bo have to share a single day, and every detail has to be re-decided.

In this episode:

• Meat and wine at the seuda — for whom, and where do the "friends" end and the minyan metzumtzam begin?
• Bigdei Shabbos on a weekday of mourning — does the avi haben get what the ba'al bris gets?
• The haircut question — may he shave or trim the beard, and if so, Friday or Sunday?
• Why a pidyon haben can be a private "yom tov shelahem" even shelo bizmano — and why the Chasam Sofer says it can't.

Sources: OC 551, 559, 568 (with Sha'ar Tziyon), Chasam Sofer OC 158, Sha'arei Teshuvah, Rama, Teshuvah m'Ahava, Noda BiYehuda. Machshavah section: Ramban (Terumah), Medrash Tanchuma (Tzav), Ben Ish Chai.