Why is this move so much better?

Engine says Nb3 is +5 here, and Nf3 is only +1. Why is Nb3 so much better? Their utility seems pretty identical to me.

https://lichess.org/Ne4mhtMS/white#68

Engine says Nb3 is +5 here, and Nf3 is only +1. Why is Nb3 so much better? Their utility seems pretty identical to me. https://lichess.org/Ne4mhtMS/white#68

tpr

The difference is that Nb3 allows to answer ...Ke6 with Nc5+ forking king and pawn d3 to win.
Nf3? allows yo answer ...Ke6 with Nd4+, but that does not eliminate pawn d3 and leads to a draw.

The difference is that Nb3 allows to answer ...Ke6 with Nc5+ forking king and pawn d3 to win. Nf3? allows yo answer ...Ke6 with Nd4+, but that does not eliminate pawn d3 and leads to a draw.