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

EGTB: win in 4 half-moves

# move score
1 Kb6 win in 3 half-moves
2 Rb8 win in 3 half-moves
3 Kc7 win in 5 half-moves
4 Ra7 win in 5 half-moves
5 Kd8 win in 9 half-moves
6 Ka5 win in 13 half-moves
7 Kb5 win in 17 half-moves
8 Ka7 draw
9 Kab7 draw
10 Kb8 draw
11 Kcb7 draw
12 Kd7 loss in 2 half-moves