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

Book: 60 / 120

# move proof disproof
1 f5 1 60
2 Na6 1 61
3 Ba6 1 65
4 a6 1 65
5 Nf7 1 65
6 Rg8 1 65
7 Nf5 1 65
8 e6 1 65
9 Ng4 38 66
10 Kc6 1 66
11 Ke8 1 66
12 c5 1 66
13 a5 1 66
14 Ke6 3 67
15 g6 1 68
16 g5 1 78
17 e5 1 80
18 Kd6 1 81
19 Bb7 1 87
20 c6 22 733
21 Nc6 14 906
22 Qe8 22 929
23 Ng8 4