Who's the strongest player here who don't know the queen, rook, 2 bishops, or bishop+knight checkmate? I'm 1515 rapid and just learned the queen checkmate but doesn't know the 2 bishops mate.
I've had to do them all otb. You don't need to know K+B+B vs K .... you can work it out logically: it isn't difficult. K+B+N vs K is quite a lot harder. So is K+N+N vs K+p (in some positions of the p and not others)


I have been playing chess for about 20 years, and I have not once had to do a KBB v K or KBN v K mate in any of my games.