I'm a boy that just recently made Aliya. During summer, I was part of a Bekiyus Shiur that learned Makkos, and I have reviewed it multiple times. However, at this time, I would like to do it with the Tosfos, and I have in the past, found your website to be extremely helpful. However, I simply cannot make sense of the first very long Tosfos on the Dof.
Avichai Roller, Efrat, Israel
Dear Avichai,
Take a look at our Point by Point Tosfos summary. In the meantime, here is a short introduction: We know what Edim Zomemin are. Now, when the circumstances of the case are that it is not possible to turn the witnesses into Edim Zomemin even if they are found to be lying, those witnesses cannot be accepted as Kosher Edim even if they are telling the truth. That is called Edus she'Iy Atah Yachol l'Hazimah. This is the basic information that needs to be clear in order to understand Tosfos. B'Hatzlachah! If there is something specific you need, let us know.
All the best,
Reuven Weiner