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

Book: ∞ / 0

# move proof disproof
1 Kc7 0
2 Ke6 0
3 Kd6 0
4 Kd8 0
5 f5 0
6 Ke8 0
7 Kc8 0
8 Ke7 0
9 h5 0
10 a6 0
11 a5 0
12 Na6 0