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

Book: 30 / 230

# move proof disproof
1 Nf7 25 30
2 Ng8 21 30
3 a5 1 30
4 Nf5 1 30
5 Bb7 1 30
6 Kc6 1 30
7 Kd6 1 30
8 Ke6 1 30
9 Ke8 1 30
10 c5 108 31
11 Ng4 57 31
12 g6 1 49
13 g5 1 49
14 Rg8 1 49
15 Qe8 1 49
16 f5 1 54
17 a6 1 54
18 c6 1 54
19 Ba6 1 55
20 e6 1 56
21 e5 1 56
22 Na6 1 56
23 Nc6 1 56