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

Book: ∞ / 0

# move proof disproof
1 Nf8 0
2 Kd6 0
3 Kc6 0
4 Na6 0
5 Nf6 0
6 Nc6 0
7 a6 0
8 Ke6 0
9 Kc7 0
10 Ke7 0
11 Kc8 0
12 Kd8 0
13 Ke8 0
14 a5 0