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

EGTB: win in 4 half-moves

# move score
1 b5 win in 3 half-moves
2 Kd6 win in 3 half-moves
3 Kd7 win in 3 half-moves
4 Kd8 draw
5 Kf8 loss in 6 half-moves
6 Ke8 loss in 4 half-moves
7 Kf6 loss in 2 half-moves
8 Kf7 loss in 2 half-moves
9 Ke6 loss in 1 half-moves