Is there an online chess evaluation engine with a REST API? I'd like to be able to send a game or position (with castling ability presumably) to a simple REST API and get back the positional evaluation from a reasonably strong engine.

  • I don't think so.
    – SmallChess
    Mar 20 '16 at 8:07
  • For what purpose, may I ask?
    – ferit
    Mar 20 '16 at 15:35
  • I think a very simple purpose would be to allow developers to use it to create apps. On the other hand the API provider can use the requests for deep learning networks. Win-Win.
    – Nisarg
    Mar 20 '16 at 17:57
  • 1
    It is part of an evil plan to create the world's strongest chess player Mar 20 '16 at 18:18
  • 1
    Nobody expects the inquisition. analysis.cpuchess.com is pretty close, but no API Mar 21 '16 at 0:29

It is pointless to have a rest API for random position evals which have to be precomputed for near-instant response. In that case you might as well ask for an opening book. There are a few sites that with opening book querying tools, which are pretty close.


The project https://github.com/noobpwnftw/chessdb provides an API for getting engine evaluations including also the PV, with the FEN of a position as input.

E.g., try an example from the readme:


The response I got is:


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