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

EGTB: win in 2 half-moves

# move score
1 Rb2 win in 1 half-moves
2 Kb8 draw
3 Kc6 draw
4 Kc8 draw
5 Kd6 draw
6 Kd7 draw
7 Kd8 draw
8 Kb6 loss in 8 half-moves
9 Ra7 loss in 8 half-moves
10 Rb1 loss in 2 half-moves
11 Rb3 loss in 2 half-moves
12 Rb4 loss in 2 half-moves
13 Rb5 loss in 2 half-moves
14 Rb6 loss in 2 half-moves
15 Rb8 loss in 2 half-moves