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 Rb2 win in 3 half-moves
3 Kb2 win in 9 half-moves
4 Kb5 win in 9 half-moves
5 Kb6 win in 9 half-moves
6 Ka4 win in 11 half-moves
7 Ka6 draw
8 Ra1 draw
9 Kb1 loss in 2 half-moves
10 Kb3 loss in 2 half-moves
11 Kc1 loss in 2 half-moves
12 Kc3 loss in 2 half-moves
13 Kd1 loss in 2 half-moves
14 Kd2 loss in 2 half-moves
15 Kd3 loss in 2 half-moves
16 Ra3 loss in 2 half-moves
17 Ra4 loss in 2 half-moves