I think those are two different definitions. In the video, the engine correlation represents the amount of moves that matched the top move of a chess engine, as

I think those are two different definitions. In the video, the engine correlation represents the amount of moves that matched the top move of a chess engine, as defined here: https://en.chessbase.com/post/let-s-check-engine-correlation-how-to-use-it https://en.chessbase.com/post/let-s-check-engine-correlation... The accuracy metric in the article is defined a bit differently according to how Lichess computes it: https://lichess.org/page/accuracy https://lichess.org/page/accuracy