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

EGTB: win in 4 half-moves

# move score
1 Kb4 win in 3 half-moves
2 Kb5 loss in 24 half-moves
3 Ka4 loss in 22 half-moves
4 Kb6 loss in 22 half-moves
5 Ka6 loss in 20 half-moves