Two Knights' Defence

Actually black is objectively winning in this line. The key move is the timely ...c6! and somehow everything holds together.

The key move in that line is Bb3 according to the little fish

When?

i am not sure about this. i am sure i would make the wrong move. but to me when i find a good move time permiting i look for a better move. as a rule i try to make the move without a loss of piece if i can avoid sacrificing the white knight opting for a better move i would so do that way i would not be down a piece so early in the game.

Anyone who dares challenge me?

 But, as has been mentioned here many times before, that just leads to a very bad position for white after 4...Nxe4!