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

Book: ∞ / 0

# move proof disproof
1 a6 0
2 Rd8 0
3 Bg7 0
4 c5 0
5 Ng8 0
6 Re8 0
7 Nf7 0
8 Ng4 0
9 Nf5 0
10 a5 0
11 Rb8 0
12 Rc8 0