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

EGTB: win in 4 half-moves

# move score
1 b2 win in 3 half-moves
2 Ka6 draw
3 Kab7 draw
4 Kab8 draw
5 Kb6 draw
6 Kcb8 draw
7 Kd7 draw
8 Kd8 draw
9 Ka8 loss in 4 half-moves
10 Kc7 loss in 4 half-moves
11 Kcb7 loss in 4 half-moves