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 Kcd5 win in 3 half-moves
4 Kd6 win in 3 half-moves
5 Rb7 win in 3 half-moves
6 Re7 win in 3 half-moves
7 Kc6 win in 5 half-moves
8 Rc6 win in 5 half-moves
9 Kb4 draw
10 Kc3 draw
11 Kcc4 draw
12 Kd3 draw
13 Kdc4 draw
14 Kdd5 draw
15 Ra7 draw
16 Rc8 draw
17 Rd7 draw
18 Rf7 draw
19 Ke3 loss in 2 half-moves
20 Ke4 loss in 2 half-moves
21 Ke5 loss in 2 half-moves
22 Rg7 loss in 2 half-moves
23 Rh7 loss in 2 half-moves