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

Book: ∞ / 0

# move proof disproof
1 a5 0
2 f5 0
3 Na6 0
4 a6 0
5 Ke6 0
6 Nc6 0
7 Ba6 0
8 Bb7 0
9 Ke8 0
10 Kd8 0
11 Ke7 0
12 Kc7 0
13 Kd6 0
14 Kc6 0