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

EGTB: win in 4 half-moves

# move score
1 Rb8 win in 3 half-moves
2 Rb1 draw
3 Rb2 draw
4 Rb3 draw
5 Rb7 draw
6 Rc4 draw
7 Rd4 draw
8 Re4 draw
9 Rh4 draw
10 K7b7 loss in 2 half-moves
11 K7b8 loss in 2 half-moves
12 K8b7 loss in 2 half-moves
13 K8b8 loss in 2 half-moves
14 Ka6 loss in 2 half-moves
15 Kb6 loss in 2 half-moves
16 Ra4 loss in 2 half-moves
17 Rb5 loss in 2 half-moves
18 Rb6 loss in 2 half-moves
19 Rf4 loss in 2 half-moves
20 Rg4 loss in 2 half-moves