I watched the Dortmund v Schalke game and then watched Frankfurt v Moenchengladbach and enjoyed both games.
Dortmund were very good value for their win and a big bonus for the German police would be the fact that there were no fans present because this local derby has been notorious for trouble between some fans over the years.
The Frankfurt v Moenchengladbach game saw Gladbach come out winners 3-1. They went ahead 2-0 in the first 6 minutes and kept Frankfurt at bay with a good team performance in which every player worked hard to gain the victory.
It now means that both Borussias keep up their title challenge, although Bayern Munich play today and would go 4 points ahead of Dortmund if they win. After this weekend's games there are still 8 games to play.

No crowd, no difference ---the games were played and were competitive and sporting integrity was not compromised. We shall just have to wait and see whether they manage to finish the season or if the virus returns to thwart their efforts.