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 Kc6 win in 3 half-moves
3 Rb4 win in 3 half-moves
4 Rb5 win in 3 half-moves
5 Kd6 win in 5 half-moves
6 Kb5 win in 9 half-moves
7 Ra7 win in 11 half-moves
8 Ka3 draw
9 Ka5 draw
10 Kb8 draw
11 Kc8 draw
12 Kd7 draw
13 Kd8 draw
14 Rb6 draw
15 Rb8 draw
16 Kb3 loss in 2 half-moves
17 Kb4 loss in 2 half-moves
18 Rb1 loss in 2 half-moves
19 Rb2 loss in 2 half-moves
20 Rb3 loss in 2 half-moves