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

EGTB: win in 4 half-moves

# move score
1 Rb7 win in 3 half-moves
2 Rc7 draw
3 Rd7 draw
4 Rg2 draw
5 Rg4 draw
6 Rg5 draw
7 Rg6 draw
8 Rh7 draw
9 K7b7 loss in 2 half-moves
10 K7b8 loss in 2 half-moves
11 K8b7 loss in 2 half-moves
12 K8b8 loss in 2 half-moves
13 Ka6 loss in 2 half-moves
14 Kb6 loss in 2 half-moves
15 Re7 loss in 2 half-moves
16 Rf7 loss in 2 half-moves
17 Rg1 loss in 2 half-moves
18 Rg3 loss in 2 half-moves
19 Rg8 loss in 2 half-moves