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

EGTB: win in 4 half-moves

# move score
1 Rb6 win in 3 half-moves
2 Rb7 win in 3 half-moves
3 Ka7 win in 7 half-moves
4 Kd7 win in 7 half-moves
5 Kd8 win in 7 half-moves
6 Ke7 win in 7 half-moves
7 Kf7 win in 7 half-moves
8 Kf8 win in 7 half-moves
9 Rb4 win in 7 half-moves
10 Rb5 win in 7 half-moves
11 Rd8 win in 11 half-moves
12 Kb5 win in 19 half-moves
13 Kb6 win in 19 half-moves
14 Ka5 win in 21 half-moves
15 Kb7 win in 23 half-moves
16 Ra8 win in 25 half-moves
17 Rc8 win in 27 half-moves
18 Rb3 draw
19 Rb1 loss in 2 half-moves
20 Rb2 loss in 2 half-moves