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

Book: ∞ / 0

# move proof disproof
1 Ke8 0
2 Kd8 0
3 Rb8 0
4 a5 0
5 a6 0
6 Bb7 0
7 Ke7 0
8 Kc7 0
9 Ba6 0
10 Ke6 0
11 Kd6 0
12 Kc6 0