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

Book: ∞ / 0

# move proof disproof
1 a6 0
2 c4 0
3 Ba6 0
4 Nc6 0
5 Kd6 0
6 Ke6 0
7 f5 0
8 f6 0
9 e6 0
10 Kc6 0
11 Kc7 0
12 Kd8 0
13 Ke8 0
14 Na6 0
15 a5 0
16 Bb7 0