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

Book: ∞ / 0

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