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

Book: 58 / 147

# move proof disproof
1 f5 1 58
2 c5 1 58
3 Ke6 1 58
4 Nf5 1 58
5 Ng4 59 59
6 Kc6 2 59
7 e6 1 59
8 e5 1 59
9 Ke8 2 61
10 Bb7 1 71
11 Qe8 1 73
12 Rg8 1 73
13 g6 1 73
14 c6 1 73
15 a6 1 73
16 Ba6 1 75
17 Kd6 1 75
18 Na6 1 77
19 Nf7 24 78
20 g5 22 78
21 Nc6 1 78
22 a5 1 80
23 Ng8 21 82