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

EGTB: win in 1 half-moves

# move score
1 a8=R win in 5 half-moves
2 a8=K loss in 3 half-moves
3 a8=N loss in 3 half-moves
4 a8=B loss in 2 half-moves
5 a8=Q loss in 2 half-moves