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

EGTB: win in 4 half-moves

# move score
1 Kb7 win in 3 half-moves
2 Kc7 win in 3 half-moves
3 Ra6 win in 3 half-moves
4 Ra7 win in 3 half-moves
5 Kb8 win in 7 half-moves
6 Kd7 win in 11 half-moves
7 Ka6 draw
8 Kd8 draw
9 Ka4 loss in 2 half-moves
10 Kb4 loss in 2 half-moves
11 Kb5 loss in 2 half-moves
12 Kb6 loss in 2 half-moves
13 Rb8 loss in 2 half-moves