(Mishnah): [If the opening] is wider than 10 Amos, it must be reduced.

How does he do so? He puts a board on [top of the] opening of the Mavuy, and permits the Mavuy.

It was said [that this helps] for] height (if the Mavuy is too high), and Rabanan use it even for width (the opening is more than 10. We explained this like SEFER NIR.)

Question: Is it not totally breached?

Answer: It is made like an Achsadra (a building that does not have walls on all sides. We apply Pi Tikra Yored v'Sosem to the roof beams, and it is as if it has walls. Also here, the board seals the opening, through Pi Tikra Yored v'Sosem.)

Rebbi permitted an Achsadra in Beis She'arim.

Question: How many pillars did it have [on each side? If there are not enough, traffic, i.e. people walking through, nullifies the wall "created'' through Pi Tikra Yored v'Sosem..]

Answer: R. Yakov bar Acha said that R. Chiya and R. Yosah argued about this. One said that there were six, and one said that there were eight.

(R. Yakov bar Acha): They do not argue. The one who says six, he does not count the two in the corners. The one who says eight, he counts the two in the corners.

(R. Yakov bar Acha citing R. Elazar): It is not only if there were six or eight. Rather, if Rabim (many people) pass through, even if there are many pillars, they are forbidden. If Rabim do not pass through, even if there are only two [pillars], it is permitted. [The Amora'im] merely recount the case that occurred.

If an Achsadra was totally breached to Reshus ha'Rabim, R. La and R. Yochanan both say that we may carry in all of it;

(Shmuel): We may carry only in four Amos.

Question (R. Yosi): Does Shmuel not admit about a Mavuy with a roof above 20 Amos that it is Kosher [due to Pi Tikra Yored v'Sosem]?!

Answer #1: Rather, Shmuel holds that [even a Mavuy with a roof] needs, within 20, Hechsher (enough to be Kosher) Korah. (Likewise, a roof does not help for an Achsadra.)

(R. Acha citing R. Chinena citing R. Hoshayah): [One may carry only if] there is Hechsher Korah within 20.

Answer #2 (R. Yosi): Shmuel could even hold that a Mavuy with a roof above 20 Amos is Kosher. A Mavuy is unlike an Achsadra;

A Mavuy is made for use of the houses. An Achsadra is made for use of the air (to walk in it).

If a Mavuy has no roof, and he put a Korah within 20, is it not Kosher?! Whereas an Achsadra without a roof, and he put a Korah within 20, does it do anything?! (Surely it does not!)

If it was 15 Amos wide, R. Ba and Rav Huna said in the name of Rav, he makes a plank three Amos wide and Kolshehu. He distances it from the wall two Amos. The Kolshehu [above three Amos] is considered a Lechi [to permit the gap of 10], and the remaining (three Amos) are to make Omed Merubah Al ha'Chalal (what stands exceeds the gaps, in the other five Amos of the opening. R. AKIVA EIGER (Teshuvah 18) - one matter cannot serve two purposes, so for the Lechi, we need an excess over what is needed to permit through Omed Merubah. Really, the majority of five permits through Omed Merubah, but since people normally make a whole number of Amos, we need more than three so it is recognized that there is extra.)

Question: [It should suffice] that he make a plank of four Tefachim!

Was it not taught that he makes a plank four Tefachim [in the middle of a totally breached Mavuy, along its length. This makes it like two Mavo'os, and the opening of each is less than 10! - GILYONEI HA'SHAS]

Answer (R. Ba bar Papa): [He makes three Amos and Kolshehu] in order to permit both [the five, and the remaining 10] without a Korah.

Some teach that he erects a beam and a [horizontal] beam on it (Tzuras ha'Pesach). And some teach that he makes a plank four Tefachim wide.

(R. Yosah): The Halachah follows the opinion that he makes a plank four Tefachim wide.

(Beraisa - R. Shimon ben Gamliel): A Mavuy with two openings, he puts a Korah at one of them and permits it. (A Korah is a Heker. It suffices to have a Heker on one of them.)

(R. Acha citing R. Levi): The Halachah does not follow R. Shimon ben Gamliel.

(R. Ba): This is if he erects a beam and a [horizontal] beam on it (then it is like a Korah on half a Mavuy, which is invalid), but if he makes a plank four Tefachim wide, the Halachah follows R. Shimon ben Gamliel.

Support (Beraisa): A Mavuy with three openings, he puts a Korah on one of them and permits it. (This is a Stam Beraisa. Even Chachamim agree, i.e. when planks four wide separate the openings.)

R. Yosi: This is if he put it on the middle one, but if he put it on an outer one - granted, one who stands here, [he sees the Korah, so] it permits the breach here. What permits the breach there? (One who enters at the other end does not see the Korah!)

Rebuttal (of support - R. Shamai): We can establish [the Beraisa] like R. Shimon ben Gamliel, and you do not learn from this anything. (Perhaps Chachamim argue even when he makes a plank four wide! We explained this like PNEI MEIR.)