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

EGTB: loss in 3 half-moves

# move score
1 K6b7 loss in 2 half-moves
2 Ka5 loss in 2 half-moves
3 b4 loss in 1 half-moves
4 K6b6 loss in 1 half-moves
5 K7b6 loss in 1 half-moves
6 K7b7 loss in 1 half-moves
7 Ka8 loss in 1 half-moves
8 Kb8 loss in 1 half-moves