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 Kb5 win in 3 half-moves
3 Kb6 win in 3 half-moves
4 Ka4 win in 9 half-moves
5 Ka6 win in 9 half-moves
6 Kc8 win in 11 half-moves
7 Ra6 draw
8 Ka7 loss in 2 half-moves
9 Kb7 loss in 2 half-moves
10 Kc7 loss in 2 half-moves
11 Ra7 loss in 2 half-moves