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

Book: 148 / 166

# move proof disproof
1 c5 2 148
2 f5 1 148
3 Nf6 2 151
4 c6 17 154
5 Bg7 30 400
6 g4 22 493
7 Nh6 21 563
8 a5 19 619
9 f6 16 654
10 h6 17 657
11 Bh6 19 1223
12 d6 0
13 Bb7 0
14 d5 0
15 e6 0
16 Nc6 0
17 e5 0