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

Book: ∞ / 0

# move proof disproof
1 Nf6 0
2 Bh6 0
3 Bg7 0
4 Rg8 0
5 c4 0
6 a6 0
7 Kb7 0
8 Kc7 0
9 Kc8 0
10 e6 0
11 a5 0
12 e5 0