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

Book: ∞ / 0

# move proof disproof
1 a5 0
2 Kb8 0
3 b4 0
4 Ng8 0
5 a6 0
6 Kc7 0
7 f6 0
8 f5 0
9 Kd7 0
10 Rb8 0
11 e6 0
12 Kb7 0
13 Bg7 0
14 Ng4 0
15 Nf5 0
16 Kd8 0