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

EGTB: win in 4 half-moves

# move score
1 Kbb7 win in 3 half-moves
2 Ka6 win in 5 half-moves
3 Kab7 win in 5 half-moves
4 Kb6 win in 5 half-moves
5 Kc7 win in 5 half-moves
6 Kc8 draw