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

Book: ∞ / 0

# move proof disproof
1 a5 0
2 Ra7 0
3 f5 0
4 Ke6 0
5 Nf6 0
6 f6 0
7 Nh6 0
8 Bb7 0
9 Bh6 0
10 Ke8 0
11 Kd8 0
12 Kc7 0
13 Kd6 0
14 Kc6 0
15 Nc6 0
16 e5 0
17 g5 0
18 Bg7 0
19 e6 0