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

Book: ∞ / 0

# move proof disproof
1 a5 0
2 Kc7 0
3 Kc8 0
4 Ng8 0
5 a6 0
6 b4 0
7 f6 0
8 f5 0
9 e6 0
10 Ng4 0
11 Kb7 0
12 Bg7 0
13 Nf5 0