Best UnderPromotion Endgame Compilation
This one was really good!

After ke1 how is black really ahead?
if you mean ke2 then after fxg1=N+ Rxg1 Bg4+

The king is already in check on e2 what are you talking about??
After ke1, Qxd1+ kxD1, Bg4+, Ke1 the black knight is trapped.
The king is already in check on e2 what are you talking about??
After ke1, Qxd1+ kxD1, Bg4+, Ke1 the black knight is trapped.
Ke1 Qh4 g3 Qe4 wins a rook

And after Kd2? Looks like black may be able to preserve the knight a little longer, but it's very ify, and if the knight does get taken material is equal.

This underpromotion puzzle is somewhat related to my first ever bishop underpromotion puzzle. Underpromoting to a knight will not work because of Bd8! followed by the capture of the underpromoted knight, resulting in White being stalemated. Promoting to a queen or rook leads to stalemate, so the only choice for White is to underpromote to a bishop and capture the pawn on h3.
This puzzle is fan