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

EGTB: win in 4 half-moves

# move score
1 Rb5 win in 3 half-moves
2 Ra4 win in 5 half-moves
3 Rb6 win in 5 half-moves
4 Rb7 win in 5 half-moves
5 Rc4 win in 5 half-moves
6 Kd4 draw
7 Kd5 draw
8 Ke5 draw
9 Kf4 draw
10 Kf5 draw
11 Rb8 draw
12 Kd3 loss in 2 half-moves
13 Ke3 loss in 2 half-moves
14 Kf3 loss in 2 half-moves
15 Rb1 loss in 2 half-moves
16 Rb2 loss in 2 half-moves
17 Rb3 loss in 2 half-moves
18 Rd4 loss in 2 half-moves