[Avodah] What does the ShaAr HaTziYun Mean - It can be used for the Mitzvah of Matza?

[Zev Sero]

Meir Rabi wrote:

> The MBerurah concludes that nevertheless such a baked product is not 
> Chametz. I presume he means that those baking it would be vigilant and 
> ensure that it did not become Chametz.
> In the ShHaTziyun 17, he adds that it can also be used for the Mitzvah 
> of eating Matza.
> 
> This seems to be entirely unnecessary. If it is not Chametz, it is Matza 
> and one can use Matza for the Mitzavah.

Not necessarily.  It might not have counted as "bread".  Sun-baked loaves
are not bread, and one cannot say hamotzi on them or use them for the
mitzvah of matzah.  (Yet another proof, if one were necessary, against
the children's story of our ancestors taking unbaked dough out of Egypt
and the sun baking it into matzos on their shoulders.)  Ka mashma lan
that damper is not in that category, that even though it's an inferior
kind of bread it still counts as bread.

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