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 Rf8 win in 3 half-moves
3 Kb7 win in 7 half-moves
4 Kb8 win in 9 half-moves
5 Kc8 win in 9 half-moves
6 Kcd7 draw
7 Kcd8 draw
8 Ra8 draw
9 Rc8 draw
10 Rg8 draw
11 Rh8 draw
12 Kb6 loss in 2 half-moves
13 Kc6 loss in 2 half-moves
14 Kcd6 loss in 2 half-moves
15 Ke6 loss in 2 half-moves
16 Ked6 loss in 2 half-moves
17 Ked7 loss in 2 half-moves
18 Ked8 loss in 2 half-moves
19 Kf6 loss in 2 half-moves
20 Kf7 loss in 2 half-moves
21 Kf8 loss in 2 half-moves
22 Rd8 loss in 2 half-moves