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

EGTB: win in 4 half-moves

# move score
1 Kb1 win in 3 half-moves
2 Kb2 win in 3 half-moves
3 Ra8 win in 9 half-moves
4 Rb8 win in 13 half-moves
5 Ka2 draw
6 Kc4 draw
7 Kc5 draw
8 Kc6 draw
9 Kd4 draw
10 Kd6 draw
11 Ke4 draw
12 Ke5 draw
13 Ke6 draw
14 Rc8 draw
15 Rd6 draw
16 Rd7 draw
17 Re8 draw
18 Rf8 draw
19 Rg8 loss in 2 half-moves
20 Rh8 loss in 2 half-moves