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

EGTB: win in 2 half-moves

# move score
1 Rb3 win in 1 half-moves
2 Kb7 win in 5 half-moves
3 Kc6 loss in 2 half-moves
4 Kcc7 loss in 2 half-moves
5 Kcd8 loss in 2 half-moves
6 Kd6 loss in 2 half-moves
7 Kdc7 loss in 2 half-moves
8 Kdd8 loss in 2 half-moves
9 Ke6 loss in 2 half-moves
10 Ke7 loss in 2 half-moves
11 Ke8 loss in 2 half-moves
12 Ra8 loss in 2 half-moves
13 Rb1 loss in 2 half-moves
14 Rb2 loss in 2 half-moves
15 Rb4 loss in 2 half-moves
16 Rb5 loss in 2 half-moves
17 Rb6 loss in 2 half-moves
18 Rb7 loss in 2 half-moves