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

Book: ∞ / 0

# move proof disproof
1 c5 0
2 a5 0
3 Kc8 0
4 a6 0
5 Bg7 0
6 Kc7 0
7 Kd7 0
8 Nf6 0
9 Nh6 0
10 Bh6 0