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

EGTB: win in 4 half-moves

# move score
1 Kb8 win in 3 half-moves
2 K8b7 draw
3 Rd7 draw
4 Re7 draw
5 Rf7 draw
6 Rg7 draw
7 Rh7 draw
8 K6b7 loss in 2 half-moves
9 Ka5 loss in 2 half-moves
10 Kb5 loss in 2 half-moves
11 Kb6 loss in 2 half-moves
12 Rb7 loss in 2 half-moves
13 Rc7 loss in 2 half-moves