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

Book: ∞ / 0

# move proof disproof
1 f6 0
2 f5 0
3 Nf6 0
4 Ke6 0
5 Kd6 0
6 Rh7 0
7 h5 0
8 e5 0
9 Ke8 0
10 Kd8 0
11 Kc7 0
12 Kc6 0
13 e6 0
14 Nc6 0
15 Bb7 0
16 a6 0
17 Na6 0
18 Ba6 0
19 a5 0