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The fourth responsum in volume 1 (Orach Chayim) of Rabbi Yoel Teitelbaum's Divre Yoel refers (near its start) to "פסקו של מרן ז״ל בד״ח ח״ב סי׳ ו׳", "the ruling of our master's (OBM) in D.Ch. volume 2 chapter 6". What author and work are referred to?
I couldn't find it inside, but it's quoted here as coming from Rabbi Chaim of Tzanz.
It's here, Shu"t Divrei Chaim of R' Chaim of Tzanz Orach Chaim Chelek Beis Siman Vov.