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

EGTB: win in 4 half-moves

# move score
1 Kf7 win in 3 half-moves
2 Kf8 win in 3 half-moves
3 Kg7 loss in 50 half-moves
4 Kh7 loss in 48 half-moves
5 Kh8 loss in 38 half-moves