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Background: I wrote and use a custom macro in the NoteTab Pro text editor to convert PGN position analysis to XML. The resulting XML is used on my website to display chess puzzles. I need to check for legal moves in some cases. For example, a PGN move might say Rd6 in a position where two rooks can move to d6, but only one of them can legally move to d6 because the other is pinned to its King. I am disinclined to write a macro legal move checker due to the apparent complexity of the task. I do not want to reinvent the wheel.

Ideally, I am looking for an executable that can be called with FEN and next-move parameters, and return a positive or negative result based on the move's legality.

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Simple problem. python-chess is a useful Python package that can do it for you easily. You will need to get a FEN, check if your move is a legal move.

https://pypi.org/project/python-chess/

has everything you want.

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  • Hmmm... It will take me some time to digest Python-Chess. I don't speak Python. I am not sure what a package is, or what this specific package can do. Do you know of any tutorial to get a novice started with Python and this package? Until then I will take your word for it and accept your answer. Thanks.
    – clueless
    Commented Dec 11, 2018 at 17:52

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