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

EGTB: win in 2 half-moves

# move score
1 Rb8 win in 1 half-moves
2 Kc2 draw
3 Kd2 draw
4 Ra1 draw
5 Rb5 draw
6 Rb6 draw
7 Rb7 draw
8 Kb2 loss in 2 half-moves
9 Kd1 loss in 2 half-moves
10 Rb2 loss in 2 half-moves
11 Rb3 loss in 2 half-moves
12 Rb4 loss in 2 half-moves