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

EGTB: win in 4 half-moves

# move score
1 Kb5 win in 3 half-moves
2 Kb7 win in 5 half-moves
3 Kb6 win in 7 half-moves
4 Rb8 win in 7 half-moves
5 Ka5 draw
6 Ka7 draw
7 Kc2 draw
8 Kc3 draw
9 Kc4 draw
10 Kd2 draw
11 Kd4 draw
12 Ke2 draw
13 Ke3 draw
14 Ke4 draw
15 Ra7 draw
16 Rc8 draw
17 Rd8 draw
18 Re8 draw
19 Rf8 draw
20 Rg8 loss in 2 half-moves
21 Rh8 loss in 2 half-moves