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

Book: 87 / 245

# move proof disproof
1 Kf1 1 87
2 Ke2 1 87
3 c5 1 87
4 Nf3 23 88
5 Nh3 17 88
6 e4 1 88
7 a3 1 88
8 Na3 1 88
9 d4 1 88
10 f4 1 88
11 b4 1 91
12 f3 1 91
13 Kd1 2 93
14 h3 21 105
15 h4 28 260
16 g3 36 449
17 a4 30 517
18 Ne2 22 519
19 Nc3 28 552
20 b3 28 569
21 d3 0