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

EGTB: win in 4 half-moves

# move score
1 Kb5 win in 3 half-moves
2 Ka4 draw
3 Ka6 draw
4 Kb4 draw
5 Kb6 draw
6 Nc7 draw
7 Nb6 loss in 2 half-moves