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

Book: ∞ / 0

# move proof disproof
1 f4 0
2 Nc6 0
3 Na6 0
4 a6 0
5 c6 0
6 e6 0
7 a5 0
8 c5 0
9 e5 0
10 Kc6 0
11 Kd6 0
12 Ke6 0
13 Kd8 0
14 Ke8 0
15 Ba6 0
16 Bb7 0