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

Book: ∞ / 0

# move proof disproof
1 a6 0
2 Kb8 0
3 Bg7 0
4 Rg8 0
5 c4 0
6 e6 0
7 e5 0
8 Kd8 0
9 a5 0
10 Rd8 0
11 Rf8 0
12 Rb8 0
13 Kd7 0
14 g4 0
15 Nf8 0
16 Kc7 0
17 Kb7 0
18 Bf8 0
19 Nf6 0
20 Re8 0