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

EGTB: win in 4 half-moves

# move score
1 Kb4 win in 3 half-moves
2 Kb3 win in 5 half-moves
3 Kc5 win in 5 half-moves
4 Kc6 win in 5 half-moves
5 Kc7 win in 5 half-moves
6 Rc1 win in 5 half-moves
7 Ka2 draw
8 Ka4 draw
9 Kb2 draw
10 Kd5 draw
11 Kd7 draw
12 Ra2 draw
13 Rb1 draw
14 Rd1 draw
15 Re1 draw
16 Rf1 draw
17 Ke5 loss in 2 half-moves
18 Ke6 loss in 2 half-moves
19 Ke7 loss in 2 half-moves
20 Rg1 loss in 2 half-moves
21 Rh1 loss in 2 half-moves