Light Square shuffle
The bishops can only move through light or dark squares, depending on which bishop is it, and the Knights can only move from light squares to dark squares, they can never land on a square the same color as the one they left so, I guess this puzzle had something to do with that lesson.
One thing to take into account is that pieces that are in light squares are immune to the dark bishop and the same happens with dark square pieces with the light bishop.
So, let's get to it!
That's mate in 3 right there and I didn't even see it after I solved the puzzle, I was like well, and what does this achieve? I lost my queen for a rook+bishop? but then I saw the mate. I would have never seen this checkmate during a normal game but there it is.