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

EGTB: win in 4 half-moves

# move score
1 Kb5 win in 3 half-moves
2 Kb6 win in 3 half-moves
3 Kb7 win in 3 half-moves
4 Rc8 win in 3 half-moves
5 Ka7 win in 7 half-moves
6 Kd8 win in 9 half-moves
7 Ra7 win in 9 half-moves
8 Kc7 win in 17 half-moves
9 Ka5 draw
10 Kc8 draw
11 Ke7 draw
12 Ke8 draw
13 Rb8 draw
14 Rd8 draw
15 Rg8 draw
16 Rh8 draw
17 Kc6 loss in 2 half-moves
18 Kd6 loss in 2 half-moves
19 Ke6 loss in 2 half-moves
20 Re8 loss in 2 half-moves
21 Rf8 loss in 2 half-moves