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

Book: 121 / 980

# move proof disproof
1 Ng5 90 121
2 e4 63 122
3 Rf1 74 182
4 Ke2 41 191
5 Rg1 94 192
6 d3 35 198
7 a4 41 241
8 Na3 44 248
9 g3 48 249
10 Nc3 48 251
11 f3 29 252
12 b3 44 267
13 c4 42 275
14 Kf1 41 279
15 Nf4 30 294
16 b4 26 298
17 d4 25 320
18 a3 38 330
19 Kd1 33 332
20 c3 38 352
21 f4 27 450
22 Ng1 29 527