When I grew up my favorite chess player was Anatoly Karpov. However, the game I won today should have made him cry.
I had a strong material advantage, it was a 30 minute game and I won despite my opponent had twice a mate in two.
Actually he resigned in a mate in two position.
To be fair I had also my mate in 4 and didn't notice either.
So try it yourself to get a mate in 4: