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

Book: ∞ / 0

# move proof disproof
1 f5 0
2 Qa5 0
3 c4 0
4 Qb6 0
5 Qh8 0
6 Qg8 0
7 a5 0
8 e6 0
9 Qf8 0
10 a6 0
11 Na6 0
12 Nc6 0
13 Qe8 0
14 f6 0
15 Ba6 0
16 Bb7 0
17 e5 0
18 Kc7 0
19 Kd6 0
20 Ke6 0
21 Qc7 0
22 Ke8 0
23 Kc6 0