Longest opening (most book moves)?

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Avatar of Abirdwithinternetyt

What opening has the most consecutive book moves, and how many moves is it? I've seen one where, if you play it through completely, white gets 22, and black gets 21. Is this topped by some obscure, rarely played opening? Offhand, I cannot remember the name of this opening, but I will look for it and update y'all when I find it. Feel free to post the most book moves you've gotten too. I'm not sure if this belongs under openings because it is more focused on the number of moves, so I'll let the mods decide.

Avatar of sigma
Ruy lopez
Avatar of hnogalski

21 moves

Avatar of tris5967

Queens gambit maybe