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

EGTB: win in 4 half-moves

# move score
1 Kb2 win in 3 half-moves
2 Kb3 win in 3 half-moves
3 Rb1 win in 3 half-moves
4 Kb5 win in 5 half-moves
5 Kc2 win in 7 half-moves
6 Kd2 win in 7 half-moves
7 Ra2 win in 7 half-moves
8 Kb4 win in 21 half-moves
9 Kb1 draw
10 Kc3 draw
11 Kc5 draw
12 Kd1 draw
13 Kd3 draw
14 Kd4 draw
15 Ra4 draw
16 Ra6 draw
17 Kd5 loss in 2 half-moves
18 Ra3 loss in 2 half-moves
19 Ra5 loss in 2 half-moves
20 Ra7 loss in 2 half-moves
21 Ra8 loss in 2 half-moves