How are null moves indicated in PGN which Lucas Chess will correctly interpret?
Context: I want to make PGN files of solution lines of series problems, in order to replay them in Lucas Chess. In serieshelpmates, Black plays a series of moves, with no White moves in between, until White checkmates. In other series problems, White plays a series of moves, with no Black moves in between.
Lucas Chess doesn't accept
-- as valid PGN. (This answer mentioned
I use Lucas Chess because it enables the user to make the app display the board diagram nice and big, with figurines in a font that is nice and clear, and even specify the square colours so that they are nice and unobtrusive. I could try another chess app instead, but I need graphics that are suitable for people whose vision is not 20/20.