b5, black has to take otherwise white queens. If axb5 then black plays c5 sacrificing another pawn. If black doesn't take white takes b and queens. If b x c5 then white queens on a
1. b5 axb5 2. c5 bxc5 3. a5 c4 4. a6 c3 5. a7 c2 6. a8=Q c1=Q. Black is winning.
Easy
D
.d
Se
Nb6+,Kb8,Rc3,b1=Q,Nd7+,Ka7,Ra3+,Kb7,Rb3+,QxRb3,Kc3+,Kb6,NxQb3
after QxRb3,Nc3 sorry
Nice