Looks like En Passant.
I do invite you to look FIDE rules.
https://www.fide.com/FIDE/handbook/LawsOfChess.pdf
The crazy thing is, you aren't the first person to think this is a bug...
On 2/10/19 10:38 AM, Alex Alex wrote:
Движок:
fairymax
"Fruit 2.1" -fcp fruit -fUCI
"Crafty" -fcp crafty
"GNU Chess" -fcp gnuchess
maxqi
shamax
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