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

Book: ∞ / 0

# move proof disproof
1 f6 0
2 a6 0
3 a5 0
4 Ng4 0
5 Ng8 0
6 d6 0
7 Nf5 0
8 d5 0
9 f5 0
10 Nc6 0
11 Na6 0