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

Book: ∞ / 0

# move proof disproof
1 e3 0
2 c6 0
3 a6 0
4 Na6 0
5 Nc6 0
6 Ba6 0
7 Ke8 0
8 Kd8 0
9 Ke7 0
10 Ke6 0
11 Kd6 0
12 Bb7 0
13 c5 0
14 f4 0
15 a5 0
16 Kc6 0