claims to use "the strongest [chess] engine out there" - then doesn't name it? presumably this is equivalent to stockfish or leela, or AlphaZero. not saying w

claims to use "the strongest [chess] engine out there" - then doesn't name it? presumably this is equivalent to stockfish or leela, or AlphaZero. not saying what's "behind the curtain" => fail. fwiw, lichess.org is free, stable, open source and uses strongest engines: stockfish, leela, and is free.