The Gemara brings a braysa, which says that if someone made a mistake and did not mention Rosh Chodesh in Shachris, he does not need to repeat Shemoneh Esrai because he can say it by Mussuf. And the conclusion of the Gemara is that this braysa is talking about b'tziybur - when he is davening with a minyan.

Rashi says that he does not repeat it because he hears it from the shliyach tzibur, but if he is b'yochid, he must repeat Shemoneh Esrai.

According to the Ayin Mishpat Ner Mitzvah, this is brought down l'halacha in Kuf Chuf Vuv - by hilchos shliyach tzibur sheta'a. [Not like Rashi, who indicated that we are talking about someone other than the shliyach tzibur, who is davening btzibur - not the sh'liyach tzibur himself.]

However, just a few lines later, the very last Gemara in the perek is about the halacha that a person does not repeat Shemona Esrai if he forgets Rosh Chodesh at Maariv because bais din is not mekadesh the chodesh at night. This is brought down l'halacha in Taf Chuf Bais - At Maariv you do not repeat Shemona Esrai, and by all other Tefilos you do repeat Shemona Esrai.

Is Tuf Chuf Bais only talking about a person who is not davening with a tzibur (like Rashi)? I don't see any indication in Tuf Chuf Bais (unless I missed something) that the halacha only applies if he is davening b'yochid.

And if so, where do we see brought down l'halacha that a person who is davening b'tzibur can rely on listening to the Shliyach T'zibur and the fact that he will say it in the next tefila?

Thanks,

Dovid