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

Book: ∞ / 0

# move proof disproof
1 Rc8 0
2 Ra8 0
3 Bf6 0
4 a5 0
5 a6 0
6 Bf8 0
7 e4 0
8 Bh6 0
9 Rg8 0
10 h5 0
11 Rf8 0
12 Rb8 0
13 Re8 0
14 Rd8 0
15 h6 0