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

EGTB: win in 4 half-moves

# move score
1 Kb8 win in 3 half-moves
2 Kc6 win in 3 half-moves
3 Kc8 win in 3 half-moves
4 Kcb6 win in 3 half-moves
5 Ra6 win in 3 half-moves
6 Ra8 win in 3 half-moves
7 Kb5 win in 7 half-moves
8 Ka4 draw
9 Ka6 draw
10 Kab6 draw
11 Kb7 draw
12 Kd6 draw
13 Kd7 draw
14 Kd8 draw
15 Rb7 draw
16 Kb4 loss in 2 half-moves