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

Book: ∞ / 0

# move proof disproof
1 f6 0
2 Rb8 0
3 a5 0
4 Nf6 0
5 h5 0
6 e5 0
7 c5 0
8 f5 0
9 Rd8 0
10 Re8 0
11 Rc8 0
12 c6 0
13 a6 0
14 e6 0
15 Bg7 0
16 g5 0
17 Rh7 0