En Passant vs In Passing In Lasker's Manual of Chess (written 1932 or earlier) I have just read the phrase 'in passing' referring to the en passant capture. I wonder if this expression is old-fashioned or still in use. Basically, I am interested in whether I can say 'in passing' in spoken language and still be considered correct.

The image  shows the exact context. The phrase is right below the diagram.
According to wikipedia:


  En passant (from French: in passing) is a move in chess.


As far as i can find, 'In passing' is the translation of the name of the move, however it is not actually spoken as 'en passant' is used instead.

One explanation for the appearance of this term is that Lasker, the author of the book, accidentally translated the word. According to this page, the original form of this manual was written in German, and Lasker re-wrote it in English at a later date. He may have translated 'En Passant' into English by mistake, not realising that we also use the french for the term.


  In 1926 Lasker wrote Lehrbuch des Schachspiels, which he re-wrote in English in 1927 as Lasker's Manual of Chess.