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

Book: ∞ / 0

# move proof disproof
1 f5 0
2 b5 0
3 b6 0
4 Kc6 0
5 Kc7 0
6 f6 0
7 h5 0
8 Na6 0
9 e5 0
10 a6 0
11 Bg7 0
12 Ke5 0
13 e6 0
14 Kc5 0
15 Ke6 0
16 Nc6 0
17 Kd5 0