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

EGTB: win in 6 half-moves

# move score
1 Kb7 win in 5 half-moves
2 Kb8 win in 5 half-moves
3 Kb5 win in 13 half-moves
4 b5 loss in 4 half-moves
5 Kb4 loss in 4 half-moves
6 Kc5 loss in 4 half-moves
7 Kc7 loss in 4 half-moves
8 Kd4 loss in 4 half-moves
9 Kd5 loss in 4 half-moves
10 Kd7 loss in 4 half-moves
11 Kd8 loss in 4 half-moves
12 Nc7 loss in 4 half-moves
13 Nd6 loss in 4 half-moves
14 Kb3 loss in 2 half-moves
15 Kc3 loss in 2 half-moves
16 Kd3 loss in 2 half-moves
17 Nf6 loss in 2 half-moves
18 Ng7 loss in 2 half-moves