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

Book: 80 / 118

# move proof disproof
1 e5 1 80
2 a6 1 80
3 c6 1 80
4 Qe8 1 80
5 h5 1 81
6 a5 1 83
7 Bb7 2 84
8 Ba6 1 85
9 f5 1 85
10 g5 68 86
11 c5 1 88
12 g6 1 90
13 Kd6 1 90
14 Ke6 3 95
15 Nc6 1 96
16 Na6 1 96
17 Rg8 23 361
18 Kc6 6 876
19 Ke8 3 1480
20 e6 0 ∞
21 h6 0 ∞