Click on the third or sixth rank to set the en passant target square.

EGTB: win in 22 half-moves

# move score
1 b5 win in 21 half-moves
2 Kc6 loss in 6 half-moves
3 Kcc8 loss in 6 half-moves
4 Kbb7 loss in 4 half-moves
5 Kd6 loss in 4 half-moves
6 Kd7 loss in 4 half-moves
7 Kd8 loss in 4 half-moves
8 Ka7 loss in 3 half-moves
9 Kbc8 loss in 3 half-moves
10 Kcb7 loss in 3 half-moves