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

EGTB: win in 4 half-moves

# move score
1 Kb6 win in 3 half-moves
2 Kb8 win in 3 half-moves
3 Rb8 win in 5 half-moves
4 K6b7 draw
5 K6c7 draw
6 K6d7 draw
7 Kb5 draw
8 Kc5 draw
9 Kd5 draw
10 Kd6 draw
11 Kd8 draw
12 Ra3 draw
13 Ra6 draw
14 K8b7 loss in 2 half-moves
15 K8c7 loss in 2 half-moves
16 K8d7 loss in 2 half-moves
17 Ra1 loss in 2 half-moves
18 Ra2 loss in 2 half-moves
19 Ra4 loss in 2 half-moves
20 Ra5 loss in 2 half-moves
21 Ra7 loss in 2 half-moves