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

EGTB: win in 4 half-moves

# move score
1 Kb7 win in 3 half-moves
2 Kc7 win in 5 half-moves
3 Kd7 win in 5 half-moves
4 Kb8 win in 7 half-moves
5 Kd8 win in 11 half-moves