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

Book: ∞ / 0

# move proof disproof
1 g4 0
2 c5 0
3 Ke6 0
4 Kd6 0
5 Kc7 0
6 Na6 0
7 Ba6 0
8 Bb7 0
9 a6 0
10 Ke8 0
11 Kd8 0
12 a5 0
13 Ke7 0