Chess Puzzle - Series 3033

White to move. How should white proceed ?

Source : chessdailynews.com

GM_Knockout said ;

1. b4!! axb4
2. Rh1! b3
3. Rh2+ Kc3
4. Rh3+ Kb2
5. Rxb3+ Kxa2
6. Rxb5

OR

1. b4!! Kb2
2. Rh1! axb4
3. Rh2+ Kc3
4. Kg7 Kc4
5. Rh3

- Black resigned 1-0