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

EGTB: win in 4 half-moves

# move score
1 Kb8 win in 3 half-moves
2 Ka5 win in 7 half-moves
3 Kb5 win in 7 half-moves
4 Kc5 win in 7 half-moves
5 Kd8 win in 7 half-moves
6 Rb8 win in 7 half-moves
7 Ra4 win in 9 half-moves
8 Ka4 win in 11 half-moves
9 Kc4 win in 11 half-moves
10 Ka3 draw
11 Kb3 draw
12 Kc3 draw
13 Ra2 draw
14 Kb7 loss in 2 half-moves
15 Kc7 loss in 2 half-moves
16 Kd7 loss in 2 half-moves
17 Ra1 loss in 2 half-moves
18 Ra3 loss in 2 half-moves
19 Ra5 loss in 2 half-moves
20 Ra6 loss in 2 half-moves
21 Ra7 loss in 2 half-moves