Chess Puzzle - Series 3019

White to move. How should white proceed ?

Iturrizaga Bonelli, Eduardo VS Battaglini, Gabriel ( Biel 2019 )

Source : chessdailynews.com

GM_Knockout said ;

1. Ncd5!! Kd8
2. b4!

OR

1. Ncd5!! Kd7
2. b4!

- Black resigned 1-0