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

EGTB: win in 4 half-moves

# move score
1 Rb8 win in 3 half-moves
2 Rb7 win in 15 half-moves
3 Kb3 draw
4 Kb5 draw
5 Kc3 draw
6 Kc5 draw
7 Kd4 draw
8 Kd5 draw
9 Kf7 draw
10 Kf8 draw
11 Kg7 draw
12 Kh7 draw
13 Kh8 draw
14 Ra4 draw
15 Rb3 draw
16 Rb5 draw
17 Rb6 draw
18 Kd3 loss in 2 half-moves
19 Rb1 loss in 2 half-moves
20 Rb2 loss in 2 half-moves