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

EGTB: win in 2 half-moves

# move score
1 Kb5 win in 1 half-moves
2 b5 loss in 1 half-moves
3 K6b7 loss in 1 half-moves
4 K7b7 loss in 1 half-moves
5 Ka5 loss in 1 half-moves
6 Ka8 loss in 1 half-moves
7 Kb8 loss in 1 half-moves