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 Rd8 win in 3 half-moves
3 Kb7 win in 5 half-moves
4 Kc7 win in 5 half-moves
5 Kd7 win in 5 half-moves
6 Rc7 win in 5 half-moves
7 K5b5 draw
8 K5b6 draw
9 K6b5 draw
10 K6b6 draw
11 Kb4 draw
12 Kc4 draw
13 Ra8 draw
14 Re8 draw
15 K5d5 loss in 2 half-moves
16 K5d6 loss in 2 half-moves
17 K6d5 loss in 2 half-moves
18 K6d6 loss in 2 half-moves
19 Kd4 loss in 2 half-moves
20 Rf8 loss in 2 half-moves
21 Rg8 loss in 2 half-moves
22 Rh8 loss in 2 half-moves