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 Kb5 win in 7 half-moves
3 Rb1 win in 7 half-moves
4 Rb2 win in 7 half-moves
5 Rb6 win in 7 half-moves
6 Ra7 win in 9 half-moves
7 K6b6 draw
8 K7b6 draw
9 Kb8 draw
10 Kc5 draw
11 Kc8 draw
12 Kd8 draw
13 Rb3 draw
14 K6d6 loss in 2 half-moves
15 K6d7 loss in 2 half-moves
16 K7d6 loss in 2 half-moves
17 K7d7 loss in 2 half-moves
18 Kd5 loss in 2 half-moves
19 Rb4 loss in 2 half-moves
20 Rb5 loss in 2 half-moves