'Deus X' Unveiled as FAT FRITZ PROJECT.
Fritz chess 15 license#
In summer 2021, the Stockfish team filed a lawsuit against ChessBase to enforce the consequences of the license termination concerning Fat Fritz 2 and the allegedly Stockfish derivative Houdini 6 sold by ChessBase. The Stockfish community, denying Fat Fritz 2's originality as claimed by ChessBase, initially reacted with the release of Stockfish 13 on Febru.
While the separated none GPL licensed NNUE file had a replacement on GitHub, it was not identical with the commercial purchased network, yielding in weaker play. The initial release had the 40 MiB NNUE file embedded inside the Fat Fritz 2 executable,Īnd was soon separated after the intervention of the Stockfish community due to a possible GPL license violation. Using the original Fat Fritz as initial supervisor to evaluate chess positions, the learning of Fat Fritz 2 was reinforced by Stockfish's alpha-beta search. The network was trained by Albert Silver with the help of Daniel Uranga and Dietrich Kappe, who provided scripts and ideas.įurther credits were given to the Stockfish contributors, and in particular Yu Nasu for his groundbreaking work on NNUE, and Hisayori Noda for the initial Stockfish NNUE implementation. Lc0 and DeusX aka Fat Fritz components Fat Fritz 2įat Fritz 2, released on February 09, 2021, is based on NNUE technology and Stockfish 12 with a double sized network,Īnd thus, running on a CPU, not requiring expensive GPU graphic cards for game playing like its predecessor. Fat Fritz was further supported by Daniel Uranga. The project and its underlying techniques were emphasized by a talk of AlphaZero co-author Thore Graepel at ChessBase, attended by German computer chess icon Thomas Nitsche along with his sons and Math42 authors Raphael Nitsche and Maxim Nitsche. Initially introduced as a cloud project in summer 2019, inspired by DeepMind's ground breaking AlphaZero approach combining Deep learning with Monte-Carlo Tree Search (MCTS) ,Īnd Albert Silver's Deus X experience, relaxing Leela Chess' "Zero" paradigm of pure reinforcement learning due to supervised learning, Fat Fritz was released in November 2019 as part the Fritz 17 package,īest supported by a GPU card such as Nvidia GeForce 20 series.
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