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This article focuses on "how to understand ChessBase plagiarism open source chess engine Stockfish", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to understand ChessBase plagiarizing the open source chess engine Stockfish.

ChessBase, a well-known chess software company, released this month that Fat Fritz 2.0 Fat Fritz 2.0 is a successor to Fat Fritz, which is based on the famous AlphaGo algorithm. ChessBase claims in its promotional document that Fat Fritz 2.0 uses the new Japanese AI technology to achieve the best performance on ordinary computer processors without the need for expensive graphics cards.

In addition, according to the official introduction, the vast neural network of Fat Fritz 2.0 is trained by the original Fat Fritz and uses search technology from Stockfish. The combination of two powerful technologies takes this new version of chess analysis to a whole new level.

It seems that this is just a regular product iterative upgrade, except that the promotional copy is slightly exaggerated, there is nothing wrong with it. However, this is not the case. the commercial software, which sells for 99.90 euros, is considered a derivative of Stockfish, which modifies several lines of code (engine name, author list and some parameters) based on Stockfish to add a set of NNUE algorithms that claim to be proprietary. After packaging, it has become its own original product, and does not comply with the open source agreement to open source the corresponding modified code.

Stockfish is a chess engine under the GPLv3 open source license, and Stockfish 12, released last September, began to support NNUE, which allows you to run neural networks quickly on CPU. This feature significantly improves Stockfish and restores its status as the most powerful chess engine available.

Of course, it is legal and reasonable to sell products based on open source projects, and Stockfish maintainers have no objection to this behavior, so ChessBase has no problem selling Fat Fritz 2.0, but its scolded behavior is that it uses open source projects without indicating the source-- even using open source project code almost intact but claiming its originality in places where there is no originality. In addition, there is no open source modified code in compliance with the GPL agreement-the corresponding C++ code was not open source until the Stockfish maintainer was told that it violated the agreement, but no NNUE neural network was provided.

The Stockfish maintainer believes that it is allowed to sell modified copies according to GPLv3,Chessbase, but must provide the corresponding modified source code and all the information needed to build the program.

A comparison of the differences between the open source code provided by ChessBase and the Stockfish code shows that Fat Fritz 2.0 released by ChessBase has modified only a few files of Stockfish:

Some people point out that this is not the first time that ChessBase has seen such plagiarism. Its previous DeusX and Fat Fritz are both thought to use the open source Leela go engine, but they were not mentioned when they were introduced to the market, and the propaganda caliber is "a new engine created by themselves."

At this point, I believe you have a deeper understanding of "how to understand ChessBase plagiarism open source chess engine Stockfish". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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