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

Book: ∞ / 0

# move proof disproof
1 f5 0
2 Nf8 0
3 e5 0
4 f6 0
5 Ke6 0
6 Na6 0
7 e6 0
8 Rd8 0
9 Re8 0
10 Rf8 0
11 Nc6 0
12 Bb7 0
13 Ke8 0
14 Kd8 0
15 Kc7 0
16 Kc6 0
17 Kd6 0
18 a5 0
19 Rg8 0
20 Nf6 0
21 Ng5 0
22 Ba6 0
23 a6 0