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

Book: ∞ / 0

# move proof disproof
1 f6 0
2 Nf6 0
3 e5 0
4 b5 0
5 d5 0
6 d6 0
7 g6 0
8 g5 0
9 f5 0
10 Nc6 0
11 a6 0
12 Na6 0
13 Kd8 0
14 e6 0
15 Nh6 0
16 b3 0
17 b6 0