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

Book: ∞ / 0

# move proof disproof
1 a6 0
2 c5 0
3 Kd6 0
4 Bb7 0
5 Na6 0
6 Ke7 0
7 Ke8 0
8 Kd8 0
9 Ba6 0
10 Kc7 0
11 a5 0
12 Ke6 0