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

Book: ∞ / 0

# move proof disproof
1 Ke6 0
2 c5 0
3 a5 0
4 a6 0
5 e4 0
6 Ba6 0
7 Na6 0
8 Kd6 0
9 Ke8 0
10 Kd8 0
11 Ke7 0
12 Kc7 0
13 Bb7 0