5 Move Mate
Wanna finish fast? Then you are at the right place!
First, White a.k.a You, move your e2 Pawn to e4, The 'King's Pawn Opening', followed by Black's d7 Pawn to d6, The 'Caro-Kann Opening'. Now, instead of moving the d7 Pawn to the center, we move the b1 Knight to c3, to protect the Pawn, like shown below:
Caro-Kann Defence: 2. Nc5
Now, of course, Black moves their d7 Pawn to d5, attacking the e4 Pawn. We move the Queen to e2, defending the e4 Pawn. Now, if Black takes the e4 Pawn, it is crucial for White to take Black's Pawn using the Knight:
Caro-Kann: 4.Kxe4
Now, if Black tries to move their Queen-Side Knight to d7, the idea is to place the same knight to f6 and threaten to capture our Knight, White can simply do the move Nd6#(Knight to d6, CheckMate). This is because the Pawn on e7 is pinned to the King by the White Queen, and there is no other attacking piece on the d6 square.
Black's Blunder
The Full Checkmate