See https://de.wikipedia.org/wiki/Benutzer:Elitre_(WMF)/sandbox?veaction=edit .
Place your cursor after the last period of any section, and start typing.
The first letter of your word will get added to the beginning of the following line.
Hit Backspace; now the whole word appears there.
Verified also on en.wp on the Chess article.

Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=51932