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

EGTB: win in 4 half-moves

# move score
1 Kb4 win in 3 half-moves
2 Kc2 win in 3 half-moves
3 Kd4 win in 3 half-moves
4 Rc1 win in 3 half-moves
5 Kd2 win in 5 half-moves
6 Ra2 win in 5 half-moves
7 Ra4 win in 5 half-moves
8 Kb5 win in 9 half-moves
9 Kb6 win in 9 half-moves
10 Rb1 win in 9 half-moves
11 Kc4 win in 13 half-moves
12 Kc1 draw
13 Kc6 draw
14 Ke1 draw
15 Ke2 draw
16 Ra3 draw
17 Ra5 draw
18 Ra6 draw
19 Kd5 loss in 2 half-moves
20 Kd6 loss in 2 half-moves
21 Ra7 loss in 2 half-moves
22 Ra8 loss in 2 half-moves