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

Book: ∞ / 0

# move proof disproof
1 f5 0
2 a5 0
3 Re8 0
4 Nb4 0
5 Nd4 0
6 e5 0
7 e6 0
8 f6 0
9 Nh6 0
10 a6 0
11 g5 0
12 g6 0
13 Nf6 0
14 Na5 0
15 Ne5 0
16 Rc8 0
17 Nd8 0
18 Nb8 0
19 Rb8 0
20 Rd8 0