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

EGTB: win in 4 half-moves

# move score
1 Rb2 win in 3 half-moves
2 Rb3 draw
3 Rb4 draw
4 Rb5 draw
5 Rc8 draw
6 Rd8 draw
7 Re8 draw
8 Rf8 draw
9 Ka1 loss in 2 half-moves
10 Ka2 loss in 2 half-moves
11 Kbb2 loss in 2 half-moves
12 Kbc2 loss in 2 half-moves
13 Kcb2 loss in 2 half-moves
14 Kcc2 loss in 2 half-moves
15 Kd1 loss in 2 half-moves
16 Kd2 loss in 2 half-moves
17 Ra8 loss in 2 half-moves
18 Rb6 loss in 2 half-moves
19 Rb7 loss in 2 half-moves
20 Rg8 loss in 2 half-moves
21 Rh8 loss in 2 half-moves