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 e5 0
6 e6 0
7 g5 0
8 c5 0
9 f5 0
10 h5 0
11 Rd8 0
12 Rh8 0
13 Re8 0
14 Rc8 0
15 g6 0
16 c6 0
17 a6 0