Acquiring a Get Through a Chatzer: Two Places vs. One

This shiur analyzes Gittin 77b and addresses a fundamental question: what constitutes "one place" versus "two places" when a get falls in a woman's courtyard? The Gemara (גמרא) presents the case where a get falls onto a board (pisla) measuring four by four amos in the woman's courtyard. If the board is four by four amos, it's considered a separate place and the divorce is invalid. If it's less than four amos but ten tefachim high, it's also a separate place. The Gemara establishes clear parameters: dalet amos by dalet amos creates a separate reshus, as does anything over ten tefachim high, and anything with a "shem levai" (its own name/identity) is also considered separate. Tosafos (תוספות) introduces two conditions not explicit in the Gemara. First, when the Gemara says dalet amos by dalet amos is invalid, Tosafos adds that this only applies if the board is more than three tefachim off the ground; less than three falls under the principle of lavud and remains part of the original chatzer. Second, when the Gemara says anything above ten tefachim is a separate place even if less than dalet amos, Tosafos limits this to items at least four tefachim by four tefachim—below that size, even if ten tefachim high, she would still be divorced. Tosafos derives these qualifications from hilchos Shabbos (שבת), assuming the Gemara didn't need to state what "everyone knows" about reshus definitions.