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

EGTB: win in 4 half-moves

# move score
1 Rb4 win in 3 half-moves
2 Rb5 win in 3 half-moves
3 Rb6 win in 3 half-moves
4 Rb7 win in 3 half-moves
5 Ka5 win in 7 half-moves
6 Ka7 win in 7 half-moves
7 Kb5 win in 7 half-moves
8 Kb6 win in 7 half-moves
9 Kb7 win in 7 half-moves
10 Ra3 win in 7 half-moves
11 Rb8 win in 7 half-moves
12 Kb2 draw
13 Kb4 draw
14 Kc2 draw
15 Kc4 draw
16 Kd4 draw
17 Kd2 loss in 2 half-moves
18 Kd3 loss in 2 half-moves
19 Rb1 loss in 2 half-moves
20 Rb2 loss in 2 half-moves