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

EGTB: win in 4 half-moves

# move score
1 Kb5 win in 3 half-moves
2 Kb6 win in 3 half-moves
3 Rb7 win in 3 half-moves
4 Ka6 win in 7 half-moves
5 Ka4 draw
6 Ka8 draw
7 Kb4 draw
8 Kb7 draw
9 Kc7 draw
10 Kc8 draw
11 Ra8 draw
12 Rc7 draw
13 Rd7 draw
14 Rh7 draw
15 Ra6 loss in 2 half-moves
16 Re7 loss in 2 half-moves
17 Rf7 loss in 2 half-moves
18 Rg7 loss in 2 half-moves