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

EGTB: win in 2 half-moves

# move score
1 Ka5 win in 1 half-moves
2 Rg7 win in 1 half-moves
3 Rh7 draw
4 Rb8 loss in 12 half-moves
5 Ka6 loss in 2 half-moves
6 Ka7 loss in 2 half-moves
7 Kc5 loss in 2 half-moves
8 Kc6 loss in 2 half-moves
9 Kc7 loss in 2 half-moves
10 Ra7 loss in 2 half-moves
11 Rc7 loss in 2 half-moves
12 Rd7 loss in 2 half-moves
13 Re7 loss in 2 half-moves
14 Rf7 loss in 2 half-moves
15 Kb5 loss in 1 half-moves