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

Book: ∞ / 0

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