(Gemara - R. Acha citing R. Chinena citing Kahana): The Halachah does not follow R. Yehudah.

Question: Had he not taught this, what would we say? R. Yehudah and Chachamim argue. Should the Halachah follow R. Yehudah?!

Answer: Because R. Yakov bar Idi said in the name of R. Yehoshua ben Levi that the Halachah follows the lenient opinion in Eruv, and R. Yitzchak bar Nachman said in the name of R. Yehoshua ben Levi that the Halachah follows R. Yochanan ben Nuri...

Question: And we questioned this - didn't R. Yakov bar Idi say in the name of R. Yehoshua ben Levi that the Halachah follows the lenient opinion in Eruv, and didn't R. Yitzchak bar Nachman say in the name of R. Yehoshua ben Levi that the Halachah follows R. Yochanan ben Nuri? (Why did he need to say this?)

And we answered, one might have thought that this is when an individual argues with an individual, but when an individual argues with Chachamim, no. R. Yitzchak bar Nachman in the name of R. Yehoshua ben Levi comes to teach that the Halachah follows R. Yochanan ben Nuri, even though Chachamim argue with him.

Here [if not for R. Acha citing R. Chinena,] we would say that the Halachah follows R. Yehudah, even though Chachamim argue with him.