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

Book: ∞ / 0

# move proof disproof
1 Nf6 0
2 Re8 0
3 Rf8 0
4 Rd8 0
5 Nd7 0
6 Na6 0
7 Nc6 0
8 a6 0
9 Kd7 0
10 Kc7 0
11 a5 0
12 Kb7 0
13 Kd8 0
14 Rg8 0
15 Nf8 0