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 Kc7 win in 5 half-moves
3 Ra8 win in 7 half-moves
4 Kd5 draw
5 Kd6 draw
6 Rd8 draw
7 Kb5 loss in 2 half-moves
8 Kb6 loss in 2 half-moves
9 Kb7 loss in 2 half-moves
10 Kc5 loss in 2 half-moves
11 Ke7 loss in 2 half-moves
12 Kf7 loss in 2 half-moves
13 Kf8 loss in 2 half-moves
14 Rc7 loss in 2 half-moves
15 Kcd7 loss in 1 half-moves
16 Kd8 loss in 1 half-moves
17 Ked7 loss in 1 half-moves