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

Book: 9 / 391

# move proof disproof
1 e4 13 9
2 Rh2 14 22
3 Qe2 12 22
4 Ke2 12 22
5 Nf3 10 22
6 Na3 9 22
7 Nc3 9 22
8 d4 8 22
9 Ne2 8 22
10 Qf3 40 23
11 Qh5 24 23
12 Bb2 21 23
13 g4 16 23
14 f4 15 23
15 f3 15 23
16 c3 15 23
17 a3 15 23
18 c4 12 23
19 a4 12 23
20 b4 12 23
21 Kf1 11 23
22 d3 8 23
23 g3 8 24
24 Ba3 27 27
25 h4 4 28
26 Qg4 41 35