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I googled stockfish "level 0" and it came up with no results. What do you mean by level 0?

The Stockfish program can be set to play at strength level 0-20. Estimates of the levels' Elo is provided here: https://github.com/official-stockfish/Stockfish/commit/a08b8...

It means it plays several times worse than a 1960s chess engine.