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 Kc6 0
4 c5 0
5 a6 0
6 Bb7 0
7 a5 0
8 Na6 0
9 Nc6 0
10 Kd6 0
11 Kd8 0
12 Ke7 0
13 Ke8 0
14 Ba6 0
15 Ke6 0