Why did my opponent resign

Honolulu147

I'm white.

 

 

notmtwain

Really not that hard to figure out that black was done.

Mike_Aronchuk

...because he was a clever fool!

Honolulu147

This was meant to be a bit of a puzzle and me being too tired late at night tongue.png

Brb2023bruhh

lol.... 5...e5?!

NelsonMoore

Your opponent resigned because his knight is en-prise and you threaten c7 next with c8 guarded. 

If black moves the knight to b6, you can still play c7 nor or play it next move, but you'll want to capture the knight on b6 before advancing to c8.