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

EGTB: win in 4 half-moves

# move score
1 Ra1 win in 3 half-moves
2 Rb7 win in 3 half-moves
3 Rb8 win in 3 half-moves
4 Kb6 draw
5 Kb7 draw
6 Ra2 draw
7 Ra3 draw
8 Rc8 draw
9 Rd8 draw
10 Re8 draw
11 Rf8 draw
12 Kb8 loss in 4 half-moves
13 Kc6 loss in 4 half-moves
14 Kc8 loss in 4 half-moves
15 Kd6 loss in 4 half-moves
16 Kd7 loss in 4 half-moves
17 Kd8 loss in 4 half-moves
18 Ra4 loss in 2 half-moves
19 Ra5 loss in 2 half-moves
20 Ra6 loss in 2 half-moves
21 Rg8 loss in 2 half-moves
22 Rh8 loss in 2 half-moves