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 Kb5 win in 5 half-moves
3 Kb7 win in 5 half-moves
4 Kc7 win in 7 half-moves
5 Ra8 win in 7 half-moves
6 Rc7 win in 7 half-moves
7 Ka2 draw
8 Ka4 draw
9 Kb2 draw
10 Kb3 draw
11 Kb4 draw
12 Kb6 draw
13 Kc5 draw
14 Kd5 draw
15 Kd6 draw
16 Kd7 draw
17 Rd8 draw
18 Re8 draw
19 Rf8 draw
20 Rg8 loss in 2 half-moves
21 Rh8 loss in 2 half-moves