Starting with a custom turn number in a study chapter

[alpha-strike]

When analyzing openings and building an opening repertoire in a study, it would be good to have the option to start with a turn number different from 1 for each study chapter.

Let's say we analyze the Ruy Lopez and create a chapter for Morphy's Defense beginning after 1.e4 e5 2.Nf3 Nc6 3.Bb4 a6. If we could set the turn number to start with 4, then the moves would go on with 4. Ba4 and so on, instead of 1. Ba4. The moves would then be displayed as they are referred to in opening theory.

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[benediktwerner]

You can already do this by modifying the turn number in the FEN. I guess we could add a clearer way to do this on /editor that would also work on the embedded editor on the chapter creation dialog?