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

EGTB: win in 4 half-moves

# move score
1 Kb6 win in 3 half-moves
2 Kb7 win in 3 half-moves
3 Kb8 win in 3 half-moves
4 Kc6 loss in 32 half-moves
5 Kd6 loss in 32 half-moves
6 Kc8 loss in 30 half-moves
7 Kd7 loss in 28 half-moves
8 Kd8 loss in 28 half-moves