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 Nd6 loss in 16 half-moves
3 Na5 loss in 12 half-moves
4 Nc5 loss in 12 half-moves
5 Nd8 loss in 12 half-moves
6 Kb6 loss in 10 half-moves
7 Kc6 loss in 10 half-moves
8 Ka6 loss in 8 half-moves
9 Ka5 loss in 6 half-moves
10 Ka4 loss in 4 half-moves
11 Kc4 loss in 2 half-moves
12 Kc5 loss in 2 half-moves