Interesting puzzle


This is a good puzzle demonstrating the pain of a rook pawn. There are some other drawing variations.
1. Kd2 also draws. 1. ... a1=Q 2. Bxa1 Kxa1 3. Kc1 Ka2 4. Kc2 Ka1 5. Kc1 draw.
There are also some variations in the line you gave. On move 3, Kb3 and Kd3 also draw (since white can still play 4. Kc2) and 4. Kc1 is also stalemate.

Thanks everybody! It's my first puzzle with endgame theme! I was very excited to publish it!
Loomis said:"1. Kd2 also draws. 1. ... a1=Q 2. Bxa1 Kxa1 3. Kc1 Ka2 4. Kc2 Ka1 5. Kc1 draw."
Thank you! I saw only 3. Kc2 Ka2 4. Kc1 Kb3... That's why I added pawns at b4 and b5, so black still wins. But I didn't see 3.Kc1!! Sometimes I am blind
'There are also some variations in the line you gave. On move 3, Kb3 and Kd3 also draw (since white can still play 4. Kc2) and 4. Kc1 is also stalemate."
I just chose forcing move, trying to make puzzle look better. I'm not professional in creating puzzles, but I'm trying!