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

Book: ∞ / 0

# move proof disproof
1 a6 0
2 a5 0
3 Na6 0
4 c5 0
5 Ke8 0
6 Kd8 0
7 Ke7 0
8 Kc7 0
9 Ke6 0
10 Kd6 0
11 Bb7 0
12 f5 0
13 f6 0
14 e4 0
15 Ba6 0