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

Book: ∞ / 0

# move proof disproof
1 f6 0
2 f5 0
3 Na6 0
4 g3 0
5 a5 0
6 Kd6 0
7 Ke6 0
8 Bh6 0
9 e6 0
10 a6 0
11 e5 0
12 Nh6 0
13 c5 0
14 Bb7 0
15 Ba6 0
16 Bg7 0
17 Nf6 0
18 Ke8 0
19 Kd8 0
20 Kc7 0