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

Book: 76 / 210

# move proof disproof
1 f5 42 76
2 g4 21 77
3 c6 2 77
4 Bg7 3 79
5 f6 3 80
6 Bb7 3 80
7 d6 1 80
8 Nf6 1 85
9 e5 1 85
10 e6 1 85
11 Nc6 1 85
12 Nh6 40 88
13 h6 20 88
14 h5 2 88
15 d5 1 91
16 Bh6 21 92
17 a5 24 94
18 c5 23 95