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

Book: ∞ / 0

# move proof disproof
1 e4 0
2 Rg8 0
3 a6 0
4 Rd8 0
5 Rb8 0
6 Rc8 0
7 Re8 0
8 a5 0
9 Rh8 0
10 Rf8 0