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

Book: ∞ / 0

# move proof disproof
1 Rd8 0
2 Rc8 0
3 Ra8 0
4 g4 0
5 Rh7 0
6 Bg7 0
7 Rb8 0
8 Nf6 0
9 a5 0
10 a6 0