Morphy's mate, named after American chess player Paul Morphy is a mating pattern against a castled king with a bishop and rook. It usually occurs after a sacrifice to rip open the position but sometimes it is not needed to do a sacrifice. Morphy used something like this pattern against Louis Paulsen in a game. It is a great way to attack a castled king that looks seemingly safe. Here is an example of the checkmate combination. The puzzle is not as hard as it looks!
I hope you enjoyed it and have fun solving and commenting!