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

EGTB: win in 4 half-moves

# move score
1 K5b4 win in 3 half-moves
2 Ka3 draw
3 Ka6 draw
4 K4b4 loss in 2 half-moves
5 K4b5 loss in 2 half-moves
6 K5b5 loss in 2 half-moves
7 Kb3 loss in 2 half-moves
8 Kb6 loss in 2 half-moves