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 Rb6 draw
6 Rb7 draw
7 Ka4 loss in 2 half-moves
8 Ka6 loss in 2 half-moves
9 Kab5 loss in 2 half-moves
10 Kb6 loss in 2 half-moves
11 Kc5 loss in 2 half-moves
12 Kcb5 loss in 2 half-moves
13 Kd4 loss in 2 half-moves
14 Kd5 loss in 2 half-moves
15 Ra4 loss in 2 half-moves
16 Rb5 loss in 2 half-moves
17 Kb3 loss in 1 half-moves
18 Kc3 loss in 1 half-moves
19 Kd3 loss in 1 half-moves