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 Ra7 0
4 c6 0
5 Ke6 0
6 Bb7 0
7 Ke8 0
8 Kd8 0
9 Ke7 0
10 Kd6 0
11 Kc6 0
12 Nc6 0