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

Book: ∞ / 0

# move proof disproof
1 f5 0
2 g6 0
3 g5 0
4 Nf6 0
5 a5 0
6 Kd6 0
7 Kc7 0
8 Kd8 0
9 Ke8 0
10 Ke6 0
11 Ba6 0
12 Bb7 0
13 Na6 0
14 a6 0
15 Nh6 0
16 f6 0
17 e6 0
18 e5 0