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 Rf4 draw
9 Rg4 draw
10 Rh4 draw
11 Ka5 loss in 2 half-moves
12 Kb5 loss in 2 half-moves
13 Kb6 loss in 2 half-moves
14 Kb8 loss in 2 half-moves
15 Ra4 loss in 2 half-moves
16 Rb5 loss in 2 half-moves
17 Rb6 loss in 2 half-moves
18 Rc4 loss in 2 half-moves
19 Rd4 loss in 2 half-moves
20 Re4 loss in 2 half-moves
21 K6a7 loss in 1 half-moves
22 K8a7 loss in 1 half-moves