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 K8b7 win in 7 half-moves
3 Kb6 win in 7 half-moves
4 K7b7 draw
5 K7b8 draw
6 K8b8 draw
7 Ka6 draw
8 Rc8 draw
9 Rd8 draw
10 Re1 draw
11 Re7 draw
12 Rf8 draw
13 Re2 loss in 2 half-moves
14 Re3 loss in 2 half-moves
15 Re4 loss in 2 half-moves
16 Re5 loss in 2 half-moves
17 Re6 loss in 2 half-moves
18 Rg8 loss in 2 half-moves
19 Rh8 loss in 2 half-moves