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

Book: 260 / 765

# move proof disproof
1 Qe8 46 260
2 Nc6 44 260
3 c5 31 260
4 Ke8 26 260
5 Ng8 23 260
6 g6 23 260
7 Nf5 19 260
8 e6 3 260
9 e5 2 260
10 Ng4 135 261
11 g5 72 261
12 Rg8 64 261
13 a6 48 261
14 a5 5 263
15 c6 59 265
16 f5 36 267
17 Kd6 3 267
18 Na6 3 268
19 Ba6 1 268
20 Ke6 31 269
21 Kc6 4 275
22 f6 87 1498
23 Bb7 0