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

Book: ∞ / 0

# move proof disproof
1 a6 0
2 Kd6 0
3 a5 0
4 Na6 0
5 Nc6 0
6 Kc7 0
7 e5 0
8 Kc6 0
9 Bb7 0
10 Ke7 0
11 Ke8 0
12 Kd8 0
13 Ba6 0