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

Book: 259 / 1093

# move proof disproof
1 e5 69 259
2 c5 57 259
3 b6 52 259
4 h6 45 259
5 a5 45 259
6 Nh6 42 259
7 a6 40 259
8 g5 25 259
9 Nc6 186 260
10 e6 154 260
11 Na6 132 260
12 f6 37 260
13 b5 24 260
14 Nf6 29 261
15 c6 45 262
16 h5 21 264
17 d6 23 265
18 d5 2 267
19 f5 19 273
20 g6 46 276