Rosh Hashanah 28: With Intent to Sin

Blowing shofar in a pit or elsewhere with an echo - distinguishing between who fulfills the obligation and who does not. Plus, a Gemara revision. Also, what happens if one hears part of the shofar blast in the pit and part out of the pit...or if it's just at the break of day... And can a tekiyah be divided to count for two? Bringing us back to the question of intent, which is most discussed in the context of shofar. Also, whether you need intent to break halakhah, to transgress a mitzvah, to sin.