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

Book: ∞ / 0

# move proof disproof
1 h4 0
2 c5 0
3 Na6 0
4 Kc6 0
5 Kd6 0
6 Ke7 0
7 Kd8 0
8 Ke8 0
9 Bb7 0
10 c6 0
11 Ba6 0
12 a5 0
13 a6 0
14 Nc6 0
15 Ke6 0