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

EGTB: win in 4 half-moves

# move score
1 Rb8 win in 3 half-moves
2 Ka4 draw
3 Ka6 draw
4 Kb8 draw
5 Kc8 draw
6 Kd7 draw
7 Kd8 draw
8 Ra7 draw
9 Rb1 draw
10 Rb2 draw
11 Rb6 draw
12 Kab6 loss in 2 half-moves
13 Kb4 loss in 2 half-moves
14 Kb5 loss in 2 half-moves
15 Kc6 loss in 2 half-moves
16 Kcb6 loss in 2 half-moves
17 Kd6 loss in 2 half-moves
18 Rb3 loss in 2 half-moves
19 Rb4 loss in 2 half-moves
20 Rb5 loss in 2 half-moves