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

Book: ∞ / 0

# move proof disproof
1 a6 0
2 Kd8 0
3 Kc8 0
4 Kd6 0
5 Na6 0
6 f5 0
7 Kb7 0
8 h5 0
9 Kd7 0
10 Kb6 0
11 a5 0
12 Nd7 0