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

Book: 27 / 373

# move proof disproof
1 g4 22 27
2 Nf5 1 27
3 Ba6 1 27
4 Kd6 1 27
5 a5 1 27
6 Ng4 154 28
7 c5 138 28
8 Nf7 22 28
9 Ng8 20 28
10 Kc6 1 29
11 Ke6 1 29
12 Ke8 1 29
13 g6 1 47
14 Bb7 1 47
15 Rg8 1 47
16 Qe8 1 47
17 a6 1 50
18 c6 1 50
19 e6 1 53
20 e5 1 53
21 Na6 1 53
22 Nc6 1 53