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 K6b7 draw
3 K8b7 draw
4 Rb1 draw
5 Rb2 draw
6 Rb3 draw
7 Rb7 draw
8 Rc4 draw
9 Rd4 draw
10 Re4 draw
11 Rf4 draw
12 Ka5 loss in 2 half-moves
13 Kb5 loss in 2 half-moves
14 Kb6 loss in 2 half-moves
15 Kb8 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 Rg4 loss in 2 half-moves
20 Rh4 loss in 2 half-moves
21 K6a7 loss in 1 half-moves
22 K8a7 loss in 1 half-moves