- No ten Amah breach: In addition to the requirement for at least two of the walls to extend throughout the majority of the length of their side of the sukkah, it is forbidden for there to be a 10 Ama [approximately 4.7 meters] stretch of open space on that side of the sukkah. If there is, then the wall is invalid, unless one performs a Tzuras Pesach to that open space in which case it is valid according to some opinions in all cases, and according to other opinions is only valid if Amud Meruba al Haparutz [by the entirety of the Sukkah]. Thus, for example, if one has a 10 x 10 m sukkah, then it does not suffice for two of the walls to have a length of 5.1 m, which is majority of that length, and rather it must be at least 5.4 m, in order to prevent an open space of 10 Amos from being created by that wall.
Michaber 630:5; Rambam Hilchos Sukkah 4:12; Mishnah Berurah 630:26.