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 Ka4 win in 5 half-moves
3 Ka5 loss in 8 half-moves
4 Ka6 loss in 8 half-moves
5 Kb6 loss in 8 half-moves
6 Kc6 loss in 8 half-moves
7 Kc4 loss in 2 half-moves
8 Kc5 loss in 2 half-moves