Quick! (Beginner puzzle)

As black can't move either knight, king or rook, white can simply push the pawn on b6 and promote to either a queen or a rook, then take the knight on f8

Several checkmate in 4 solutions.
Oh yes! I originally thought of c3, but Bc3 and Bc5 also works, and each line is slightly different, although the goal is the same (to stalemate black except for the key defender on f8). Interesting.
I wonder what solution the OP had in mind, that is "for beginners". Probably something that does not work, if I have to guess.
Several checkmate in 4 solutions.
Oh yes! I originally thought of c3, but Bc3 and Bc5 also works, and each line is slightly different, although the goal is the same (to stalemate black except for the key defender on f8). Interesting.
I wonder what solution the OP had in mind, that is "for beginners". Probably something that does not work, if I have to guess.
My original solution in mind was a checkmate in four with c3, but I failed to see
c5 which also works!