If you play live chess online, then you are familiar with games ending in Queen versus King. It doesn’t take long before you are able to do this quickly. As your rating improves, your opponents will begin resigning when they know they are lost.
Still, you will often face opponents who do not resign when faced with Queen versus King. If you are down on the clock, of course, promote to a Queen and mate your opponent quickly.
But if you are playing a longer time control and have plenty of time on the clock, why not practice Rook versus King? After you have mastered both methods of Rook versus King (there are two), then you can start practicing other mates, such as the two-bishops mate and knight and bishop.
In this video, I give an example of this situation. My opponent was dead lost. I could have gotten as many as three queens if I felt like it. I could see that he wasn’t resigning anytime soon, and I have 15+ min on the clock. So I opted to use the opportunity to practice the two-bishops mate.
I had practiced this a long time ago, but always against the computer and not against live opponents. This is important because human opponents often try different defenses than the computers try, so you have to be able to mate them efficiently in all scenarios.