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 Bb7 0
4 Nc6 0
5 Kd8 0
6 Ke8 0
7 Kc6 0
8 Ke7 0
9 Kd6 0
10 c6 0
11 a5 0
12 Ke6 0
13 f6 0
14 Ra7 0