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

Book: ∞ / 0

# move proof disproof
1 f5 0
2 Ke6 0
3 c6 0
4 c5 0
5 a6 0
6 Na6 0
7 Bb7 0
8 Ba6 0
9 a5 0
10 Nc6 0
11 Ke8 0
12 Kd8 0
13 Ke7 0
14 Kc6 0
15 Kd6 0