4 moves CHECKMATE
Once you are done seeing this post, you could defeat your opponent in Four moves easily if you are White.Please see the below moves :-
W- e4
B- e5
W-Bc4
B-Nc6
W-Qh5
B-g6
W- Qxf7#
Please see the below moves :-
W- e4
B- e5
W-Bc4
B-Nc6
W-Qh5
B-g6
W- Qxf7#