Java based Chess Board Scanner, which converts 2D chess board image into a machine readable format a.k.a. Forsyth–Edwards Notation (FEN). It uses OpenCV and Deeplearning4j frameworks, complemented with some proprietary algorithms implemented for realizing the goal. It currently supports the chess board and pieces sets of the most common online chess platforms and



This project aims to demonstrate how to extract the chess position in a machine readable format called Forsyth–Edwards Notation (FEN) having the 2D picture of the board. Initially it supports and images, although the architecture is extensible and different chess boards could be added as well. It uses OpenCV as a computer vision library and Deeplearning4j as a basis for convolutional networks for chess board classification.

Running the program

The project structure is an eclipse based project, which can be directly imported into the Eclipse IDE. All necessary libraries for Deeplearning4j are included into the libs folder, but you need to add the OpenCV library version 4.5.1 (java and native parts) and refer them from the project as described here:

The basic main class is bagaturchess.scanner.patterns.AllMain

Directions for further development

  • Improve board corners detection, besides the currently used algorithms: findChessBoardCorners by build-in function, findChessBoardCorners by Hough lines and findChessBoardCorners by contours.
  • Add additional popular online chess sites, which can be recognized by the program, like for example
  • Extend the solution to work with chess diagrams drawn on paper, this will save a lot of positions from old books in computer format.

If you would like to contribute to the project, do not hesitate to contact me.

Android Application

The code is used productively by this app, which could be found here:


This project would not be possible without:

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The author of the project is Krasimir Topchiyski.

Krasimir Topchiyski
Krasimir Topchiyski
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