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

Book: 24 / 136

# move proof disproof
1 Nf3 1 24
2 e4 1 44
3 Na3 2 45
4 b3 8 56
5 Kf1 7 56
6 Nc3 7 56
7 h4 6 56
8 d3 5 56
9 a3 3 56
10 c5 3 56
11 Rh2 3 56
12 f4 3 56
13 g3 3 56
14 Qg4 1 56
15 g4 28 57
16 a4 8 57
17 Qe2 8 57
18 d4 1 57
19 Qb3 1 58
20 Qa4 4 61
21 Qh5 21 62
22 f3 2 65
23 Ke2 1 66
24 Ne2 1 66
25 Qc2 1 67
26 b4 1 70
27 Qf3 6 71