[Avodah] Chabad and Putting on Tefillin on Chol Moed

[David Riceman]

RZS:

<<highly visible differences such as which way around Baruch She'amar 
and Hodu go would have been known earlier.>>

The history is fairly complicated, and it predates, not only the author 
of the Tanya, but the Baal Shem Tov.  See R. Daniel Goldschmidt's short 
essay ""Al Nusah HaTefilah shel Kehillot haHasidim", reprinted in his 
"Mehkrei Tefilah UPiyut" for some of the details.

David Riceman