Quiet MoveComponent and licence notices
Arasan 26.0
NNUE engine
Local analysis
How the pieces fit
Quiet Move bundles Arasan 26.0and its NNUE network for chess analysis. This configuration runs locally on the iPhone. Quiet Move builds the surrounding experience: imports, analysis settings, move classifications, accuracy, Key Moments, explanations, comparisons, review, and training.
Quiet Move’s app code is proprietary. The components credited below are open source. ChessKit provides standard chess rules and notation support. The stdendian header is included within the bundled Arasan source. The app includes these same notices for offline viewing.
Arasan 26.0
Arasan is the open-source chess engine by Jon Dart. Quiet Move pins release v26.0 at commit d8613aca11b3db15ce7f5c6d54da4dc4b31f63f8 and bundles its engine and arasanv8-20260622.nnue network under the MIT licence. No Arasan engine opening-book binary or tablebase asset is bundled at runtime.
Official project: github.com/jdart1/arasan-chess
The bundled network has SHA-256 b42f9e13a37debb4af425d2ca74b5edff1d8034a616806bccdb67b79530201ac. Arasan documents a training lineage that includes self-play and Leela Chess Zero data. Quiet Move redistributes the released network under Arasan’s MIT grant, not the training database or corpus.
Quiet Move’s generated offline opening catalogue remains a separate component derived from Arasan 22.3’s MIT-licensed book/eco text at v22.3.0, commit 2dbc0649dc6d4f726f041b4c359308e76ffa5795, plus a small project-authored Nimzo-Larsen supplement. The app ships the generated position-keyed catalogue, not an Arasan engine opening-book binary.
Read the complete Arasan licence
Arasan Chess LICENSE Arasan chess engine software, including the contents of the src, book, doc, prj, tests, and network directories of the software archive, is distributed under the following License: Copyright 1994-2026 by Jon Dart Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Notes regarding the GUI: The Arasan Windows user interface (GUI), the source of which is in the "gui" directory, is also under this license, and leverages the lundasvg SVG rendering package (https://github.com/sammycage/lunasvg), also MIT-licensed. The SVG piece images (spatial and celtic), which are loaded at runtime, are Copyright Maurizio Monge, MIT license. The chess-openings subdirectory, distributed with the GUI, is a fork of https://github.com/lichess-org/chess-openings/, and is under the Creative Commons CC0 1.0 Universal license.
stdendian
The bundled Arasan source includes stdendian.h, originally published by Michael Clark and modified by Arasan to use functions instead of macros for byte swapping and to add a Cygwin fix. The preserved source header declares the implementation Public Domain.
From michaeljclark/3b4fd912f6fa8bb598b3. Modified to use functions, not macros, for bswap; added a fix for Cygwin. Public Domain.
ChessKit
Quiet Move uses ChessKit for standard chess rules, legal move generation, FEN serialization, and SAN serialization. ChessKit is Copyright © 2020 Alexander Perechnev and is used under the MIT licence.
Official project: github.com/aperechnev/ChessKit
Read the complete ChessKit licence
MIT License Copyright (c) 2020 Alexander Perechnev Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.