This is the Cozio Variation of the Ruy Lopez, and it has appeared in other \"Games of the Day.\" Nakamura has used it a few times with Black but not often. He played a game with White against Caruana in 2024 that may have sparked his idea to play it with the other color.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5 