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

Book: 24 / 303

# move proof disproof
1 Nf3 1 24
2 e5 254 25
3 Qg4 21 25
4 Qa4 2 25
5 g4 2 25
6 Qf3 1 25
7 Qh5 1 25
8 Qb3 1 26
9 Qe2 1 27
10 c5 1 43
11 h3 1 44
12 Ne2 1 44
13 Qc2 1 44
14 Ke2 1 44
15 a3 1 45
16 b3 1 45
17 d3 1 45
18 f3 1 45
19 g3 1 45
20 a4 1 45
21 d4 1 45
22 f4 1 45
23 h4 1 45
24 Na3 1 45
25 Nc3 1 45
26 Nh3 1 45
27 Kf1 1 45
28 b4 1 48