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

Book: ∞ / 0

# move proof disproof
1 f6 0
2 Ke6 0
3 a5 0
4 d5 0
5 d6 0
6 f5 0
7 Kf6 0
8 Bb7 0
9 Kd6 0
10 Nf6 0
11 Nc6 0
12 Bg7 0
13 Ke8 0
14 Kd8 0
15 Nh6 0
16 Bh6 0