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

Book: ∞ / 0

# move proof disproof
1 Kd8 0
2 Ke8 0
3 a5 0
4 a6 0
5 Na6 0
6 Kc7 0
7 Bb7 0
8 Ke7 0
9 Nc6 0
10 Ba6 0
11 Ke6 0
12 Kc6 0
13 Kd6 0