How is this an Inaccuracy and not a book move?

[shaeelhashmi]

I have also checked the same move on the chess.com engine this should be classified as a book move but it is given as an Inaccuracy on chess kit

[GuillaumeSD]

This move was not classified as a book move because it is not in the openings database chesskit uses. I intend on improving this database at some point so those cases would happen less.

[jalpp]

@GuillaumeSD I can send a PR for using eco database I use in my app, https://github.com/jalpp/chessagineweb/tree/main/src/libs/openingdatabase I use full eco files which is better than what chesskit uses