I don't think it's optional in that situation since it would be the only legal move.
I ran the computer analysis and it didn't show a draw.
Please provide a screenshot of what you were looking at.
Is en passant capture optional in a stalemate situation?
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May 31, 2021
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#3
It's not optional. If there is a legal move, it has to be executed. E.p is nothing special.
https://www.chess.com/learn-how-to-play-chess#comment-60834105
Is gxh3 e.p. optional?