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

EGTB: win in 2 half-moves

# move score
1 Rb7 win in 1 half-moves
2 Rb8 win in 1 half-moves
3 Rb6 draw
4 Kb4 loss in 2 half-moves
5 Kc4 loss in 2 half-moves
6 Ra5 loss in 2 half-moves
7 Rb1 loss in 2 half-moves
8 Rb2 loss in 2 half-moves
9 Rb3 loss in 2 half-moves
10 Rb4 loss in 2 half-moves
11 Kb6 loss in 1 half-moves
12 Kc6 loss in 1 half-moves
13 Kd4 loss in 1 half-moves
14 Kd5 loss in 1 half-moves
15 Kd6 loss in 1 half-moves