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

Book: ∞ / 0

# move proof disproof
1 c6 0
2 Kc6 0
3 Kd8 0
4 Kd6 0
5 Ke7 0
6 Ke8 0
7 Ra7 0
8 c5 0
9 Nc6 0
10 Ke6 0
11 a5 0
12 Bb7 0