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

Book: ∞ / 0

# move proof disproof
1 a6 0
2 e6 0
3 Na6 0
4 Nd7 0
5 e5 0
6 a5 0
7 Kd7 0
8 Bg7 0
9 Kf7 0
10 Kd8 0
11 f5 0
12 h5 0