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

Book: ∞ / 0

# move proof disproof
1 Ke6 0
2 a6 0
3 e5 0
4 e6 0
5 Ba6 0
6 Bb7 0
7 Na6 0
8 a5 0
9 Ke8 0
10 Kd8 0
11 Kc7 0
12 Kd6 0
13 c5 0