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 Rc7 draw
3 Rg8 draw
4 K4b4 loss in 2 half-moves
5 K4b5 loss in 2 half-moves
6 K5b4 loss in 2 half-moves
7 K5b5 loss in 2 half-moves
8 Ka3 loss in 2 half-moves
9 Ka6 loss in 2 half-moves
10 Kb3 loss in 2 half-moves
11 Ra7 loss in 2 half-moves
12 Rb7 loss in 2 half-moves
13 Rd7 loss in 2 half-moves
14 Re7 loss in 2 half-moves
15 Rf7 loss in 2 half-moves
16 Rg1 loss in 2 half-moves
17 Rg2 loss in 2 half-moves
18 Rg3 loss in 2 half-moves
19 Rg4 loss in 2 half-moves
20 Rg5 loss in 2 half-moves
21 Rg6 loss in 2 half-moves
22 Rh7 loss in 2 half-moves