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 Kcb6 win in 3 half-moves
3 Kcb7 win in 3 half-moves
4 Rb8 win in 3 half-moves
5 Ra8 win in 7 half-moves
6 Ka6 draw
7 Ka8 draw
8 Kab6 draw
9 Kab7 draw
10 Kb8 draw
11 Kc7 draw
12 Rh8 draw
13 Kc5 loss in 2 half-moves
14 Kd5 loss in 2 half-moves
15 Kd6 loss in 2 half-moves
16 Kd7 loss in 2 half-moves
17 Rc7 loss in 2 half-moves
18 Rd8 loss in 2 half-moves
19 Re8 loss in 2 half-moves
20 Rf8 loss in 2 half-moves
21 Rg8 loss in 2 half-moves