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

EGTB: win in 4 half-moves

# move score
1 Kb2 win in 3 half-moves
2 Kc2 win in 3 half-moves
3 Kb4 win in 7 half-moves
4 Kb5 win in 7 half-moves
5 Ka2 draw
6 Ka4 draw
7 Kc1 draw
8 Ra2 draw
9 Ra3 draw
10 Ra4 draw
11 Ka6 loss in 2 half-moves
12 Kb6 loss in 2 half-moves