In Germany duelling was a legal grey zone until 1953, when it was clarified that fighting with sharp weapons under agreement to cause mutual harm is OK, as long

In Germany duelling was a legal grey zone until 1953, when it was clarified that fighting with sharp weapons under agreement to cause mutual harm is OK, as long as it not as away to settle matters of honour or kill each other. https://de.wikipedia.org/wiki/G%C3%B6ttinger_Mensurenprozess https://de.wikipedia.org/wiki/G%C3%B6ttinger_Mensurenprozess