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

Book: ∞ / 0

# move proof disproof
1 a5 0
2 Ra8 0
3 Bh6 0
4 Rd8 0
5 g5 0
6 Bg7 0
7 e5 0
8 Rb8 0
9 a6 0
10 Rc8 0