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

EGTB: draw

# move score
1 a8=R draw
2 Na5 draw
3 Nc5 draw
4 Nd6 draw
5 Nd8 draw
6 a8=B loss in 4 half-moves
7 a8=K loss in 4 half-moves
8 a8=Q loss in 4 half-moves
9 a8=N loss in 2 half-moves