I can checkmate with bishop and knight, but only if I’m sober and have at least five minutes on the clock.
tbh most players below master level can't convert that ending. I gave up on learning when I was about 16-1700. I can memorize the moves but it occurs so rarely that I forget when it comes up. Maybe I could learn it now but what's the point? It happens maybe once every couple thousand games and even then you usually have chances to trade into a better ending. I will trade into it if I'm trying to draw though and have yet to lose it.
If you understand the idea you don't have to memorize anything. It's actually pretty easy it's just most books / people who teach it are awful.
Memorize the letter W.
http://chessskill.blogspot.com/2017/05/bishop-and-knight-checkmate.html
there is no elo which can prevent a person from doing something bad.