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

EGTB: win in 4 half-moves

# move score
1 Kb5 win in 3 half-moves
2 Kb6 win in 3 half-moves
3 Ka1 win in 5 half-moves
4 Ka3 win in 5 half-moves
5 Kb1 win in 5 half-moves
6 Kb3 win in 5 half-moves
7 Kb4 win in 5 half-moves
8 Kc1 win in 5 half-moves
9 Kc3 win in 5 half-moves
10 Ra1 win in 5 half-moves
11 Ra3 win in 5 half-moves
12 Ra4 win in 5 half-moves
13 Ka6 win in 9 half-moves
14 Kc2 win in 9 half-moves
15 Ka4 draw