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

Book: ∞ / 0

# move proof disproof
1 d6 0
2 Nc6 0
3 d5 0
4 Nf6 0
5 Ne7 0
6 Nh6 0
7 Na6 0
8 a6 0
9 a5 0