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

EGTB: draw

# move score
1 Rb4 draw
2 Rb5 draw
3 Rb6 draw
4 Rb7 draw
5 Kd8 loss in 2 half-moves
6 Ra8 loss in 2 half-moves
7 Rb1 loss in 2 half-moves
8 Rb2 loss in 2 half-moves
9 Rb3 loss in 2 half-moves
10 Kb7 loss in 1 half-moves
11 Kc7 loss in 1 half-moves
12 Kd7 loss in 1 half-moves