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 Kd2 win in 3 half-moves
3 Ka4 win in 9 half-moves
4 Kd1 win in 9 half-moves
5 Ke2 win in 9 half-moves
6 Ra1 win in 15 half-moves
7 Ka6 draw
8 Kb5 draw
9 Kb6 draw
10 Kf1 draw
11 Kf2 draw
12 Rb2 draw
13 Rb3 draw
14 Rb4 draw
15 Rb5 draw
16 Rb6 draw
17 Rc1 draw
18 Rd1 draw
19 Rb7 loss in 2 half-moves
20 Rb8 loss in 2 half-moves