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

EGTB: win in 4 half-moves

# move score
1 Kab6 win in 3 half-moves
2 Kb5 win in 3 half-moves
3 Rb8 win in 5 half-moves
4 Ka5 win in 11 half-moves
5 Kaa7 draw
6 Kb8 draw
7 Kba7 draw
8 Kbb6 draw
9 Ra7 draw
10 Rg8 draw
11 Rh8 draw
12 Kc6 loss in 2 half-moves
13 Kc7 loss in 2 half-moves
14 Kc8 loss in 2 half-moves
15 Rc8 loss in 2 half-moves
16 Rd8 loss in 2 half-moves
17 Re8 loss in 2 half-moves
18 Rf8 loss in 2 half-moves