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

EGTB: win in 2 half-moves

# move score
1 Rb4 win in 1 half-moves
2 Rb6 win in 1 half-moves
3 Kb1 loss in 2 half-moves
4 Kc1 loss in 2 half-moves
5 Kc3 loss in 2 half-moves
6 Kd1 loss in 2 half-moves
7 Kd2 loss in 2 half-moves
8 Kd3 loss in 2 half-moves
9 Ra2 loss in 2 half-moves
10 Rb1 loss in 2 half-moves
11 Rb7 loss in 2 half-moves
12 Rb8 loss in 2 half-moves
13 Kb3 loss in 1 half-moves
14 Rb3 loss in 1 half-moves
15 Rb5 loss in 1 half-moves