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

EGTB: win in 1 half-moves

# move score
1 Nxb6 win in 3 half-moves
2 dxe8=B loss in 2 half-moves
3 dxe8=K loss in 2 half-moves
4 dxe8=N loss in 2 half-moves
5 dxe8=Q loss in 2 half-moves
6 dxe8=R loss in 2 half-moves