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

Book: ∞ / 0

# move proof disproof
1 f6 0
2 Bb7 0
3 h5 0
4 Ngf6 0
5 g5 0
6 Ba6 0
7 Nb8 0
8 Nb6 0
9 Nc5 0
10 f5 0
11 a5 0
12 Ne5 0
13 Ndf6 0
14 e6 0
15 Rh8 0
16 a6 0
17 c6 0
18 g6 0
19 c5 0
20 e5 0
21 Rb8 0