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

Book: ∞ / 0

# move proof disproof
1 f3 0
2 c6 0
3 c5 0
4 Na6 0
5 Nc6 0
6 Ba6 0
7 Bb7 0
8 a5 0
9 a6 0
10 Ke8 0
11 Kd8 0
12 Ke7 0
13 Kd6 0
14 Kc6 0
15 Ke6 0