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

Book: ∞ / 0

# move proof disproof
1 f4 0
2 c6 0
3 Bb7 0
4 Ba6 0
5 a5 0
6 Kd8 0
7 Ke7 0
8 Kc6 0
9 Ke6 0
10 Nc6 0
11 Na6 0
12 Ke8 0
13 a6 0
14 c5 0
15 Kd6 0