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

EGTB: win in 4 half-moves

# move score
1 Kb6 win in 3 half-moves
2 Kb7 win in 3 half-moves
3 Kb8 win in 3 half-moves
4 Rb8 win in 3 half-moves
5 Rc8 win in 3 half-moves
6 Kc5 win in 7 half-moves
7 Kc6 win in 7 half-moves
8 Kc7 win in 7 half-moves
9 Kd7 win in 7 half-moves
10 Ke7 win in 7 half-moves
11 Ke6 win in 9 half-moves
12 Ka6 draw
13 Rd8 draw
14 Rh8 draw
15 Kd5 loss in 2 half-moves
16 Ke5 loss in 2 half-moves
17 Re8 loss in 2 half-moves
18 Rf8 loss in 2 half-moves
19 Rg8 loss in 2 half-moves