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 Bb7 0
5 f6 0
6 Nh6 0
7 Nf6 0
8 Ke8 0
9 Kd8 0
10 Kc7 0
11 f5 0
12 Kd6 0
13 e6 0
14 c5 0
15 e5 0
16 Bh6 0
17 Ke6 0
18 Bg7 0
19 Ba6 0