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

Book: ∞ / 0

# move proof disproof
1 f5 0
2 c5 0
3 Ba4 0
4 Bc6 0
5 Nc6 0
6 Ke7 0
7 Bc8 0
8 a5 0
9 Bb5 0
10 Kd5 0
11 Ke5 0
12 Kf5 0
13 Ra7 0
14 Be8 0
15 c6 0
16 Kd6 0
17 Kf6 0
18 f6 0