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 Ke7 win in 3 half-moves
5 Ked7 win in 3 half-moves
6 Rf5 win in 3 half-moves
7 Rf7 win in 3 half-moves
8 Kc7 win in 5 half-moves
9 Rf6 win in 5 half-moves
10 Kcd7 win in 7 half-moves
11 Kd6 win in 7 half-moves
12 Rf4 win in 7 half-moves
13 Kf7 win in 9 half-moves
14 Kc5 draw
15 Kd5 draw
16 Kd8 draw
17 Rf3 draw
18 Rg8 draw
19 Rh8 draw
20 Rf1 loss in 2 half-moves
21 Rf2 loss in 2 half-moves