Stockfish for Mac is back! Special thanks to 0xferit (Ferit) for reviving the app and helping bring this update to life. New since 2.3.9: • Updated to the Stockfish 19 chess engine, with its latest neural network, for stronger analysis on Apple silicon and Intel Macs. • More reliable PGN import and saving, with better preservation of comments and variations, including comments before variation moves. • Better handling of damaged or incomplete PGN files: recover playable moves where possible, flag incomplete games, and preserve unread moves when saving a game you haven't edited. • Improved support for very long games and corrected threefold-repetition detection. • Engine preferences now apply during active analysis. Analysis controls also stay in sync when the engine stops or exits. • Clearer game notation and comments, plus toolbar customizations that are remembered between sessions. Requires macOS 12 Monterey or later. Thank you to our contributors and everyone who continues to use Stockfish for Mac!

- Fixes a bug where PGN files could not be opened

- Updates engine to Stockfish 17 - Fixes a bug where PGN files could not be opened

Updates engine to Stockfish 16.1, which features - Updated neural network architecture: The neural network architecture has undergone two updates and is currently in its 8th version. - Removal of handcrafted evaluation (HCE): This release marks the removal of the traditional handcrafted evaluation and the transition to a fully neural network-based approach. - Dual NNUE: For the first time, Stockfish includes a secondary neural network, used to quickly evaluate positions that are easily decided.

Updates the engine to the October 27, 2023 build (Stockfish dev-20231027-347d613b). Includes the following enhancements: - Quality of chess play: Stockfish continues to demonstrate its ability to discover superior moves with remarkable speed. In self-play against Stockfish 15, this new release gains up to 50 Elo and wins up to 12 times more game pairs than it loses. - Neural network: This updated version of Stockfish introduces several enhancements, including an upgraded neural net architecture (SFNNv6), improved implementation, and refined parameterization - New evaluation: An evaluation of +1 is now no longer tied to the value of one pawn, but to the likelihood of winning the game. With a +1 evaluation, Stockfish has now a 50% chance of winning the game against an equally strong opponent. This convention scales down evaluations a bit compared to Stockfish 15 and allows for consistent evaluations in the future.

- Updates the engine to Stockfish 15

- Adds a new option to show Win-Draw-Loss (WDL) probabilities. Enable this in the menubar: Engine > Show WDL - Arrows are now shown for all variations, with the arrow thickness corresponding to the relative ranking of the move (thicker = higher rank) - Updates the Stockfish engine to the latest development version as of October 2, 2021

- Updated analysis engine to Stockfish 14, which is significantly stronger than Stockfish 13

- Fixes a crash that occurs on the iMac Pro

- Updated analysis engine to Stockfish 13, which is 35 Elo stronger than Stockfish 12

- New app icon! - Updated analysis engine to the latest version (approx. 20 ELO stronger than Stockfish 12)

Updated Stockfish engine to latest version, now with NNUE support! NNUE replaces the classical evaluation function in Stockfish with an efficiently updatable neural network. The end result is that with NNUE, this version of Stockfish is >110 ELO stronger than Stockfish 11. NNUE is enabled by default (you can turn it off in the Engine menu). When NNUE is enabled, you'll see the neural network ID in the analysis pane. Version 2.2.3 fixes a crash that can occur when opening PGN files with mismatched braces.

Updated Stockfish engine to latest version, now with NNUE support! NNUE replaces the classical evaluation function in Stockfish with an efficiently updatable neural network. The end result is that with NNUE, this version of Stockfish is >110 ELO stronger than Stockfish 11. NNUE is enabled by default (you can turn it off in the Engine menu). When NNUE is enabled, you'll see the neural network ID in the analysis pane.

- Updated engine to version 11, which is 50 Elo stronger than the last version - New "Do Best Line" menu option (thanks Ewan Mellor) - Fixed a crash related to "New from Clipboard" (thanks Ewan Mellor)

- Support for Dark Mode in macOS Mojave - Updated engine to Stockfish 10 (about 50 ELO stronger than Stockfish 9) - "New from Clipboard" option added in File menu to directly open a FEN or PGN from the clipboard (thanks Ewan Mellor!) - Fixed crash when attempting to view About screen

- Updated engine to Stockfish 9, which is about 45 ELO stronger than Stockfish 8 in self-play - Improved parsing of PGN files

- Variations and commentary support (thanks to Adrian Buzea) - Notation is now clickable (thanks to Adrian Buzea) - Updated Stockfish engine - Improved crash reporting - Fixed a crash that could occur while the engine was analyzing

- Variations and commentary support (thanks to Adrian Buzea) - Notation is now clickable (thanks to Adrian Buzea) - Updated Stockfish engine - Improved crash reporting

- Increased stability of the principal variation (PV): you should see fewer cases where a long PV is replaced by a shorter PV.

- Updated engine to Stockfish 8, which is approximately 70 ELO stronger than Stockfish 7 according to IPON

- Updated engine to Stockfish 7

- Updated engine to Stockfish 6 - Added option to show/hide arrows in the View menu Like Stockfish? Help us out by rating us on the Mac App Store!

Introducing Stockfish 2 for Mac, the biggest update to Stockfish for Mac yet! These are just a few of the features: - UPDATED DESIGN. We've given the app a visual refresh: there's a new color scheme, dramatically improved animations, and a new toolbar. - UPDATED ENGINE. The new Stockfish engine is about 45 ELO stronger than Stockfish 5. And there's a 5% speed boost if you're using the latest Haswell processors. - MULTIPV. Sometimes you want to know the 2nd or 3rd best move in addition to the best move. Enable more lines of analysis in the Engine menu. - UNDO/REDO. Now Stockfish will warn you if you're about to overwrite the game history with a new move, and you can always undo. - ENDGAME TABLEBASES. You can select a folder of Syzygy endgame tablebases for Stockfish to use during analysis. (Tablebases downloaded separately.) - MORE OPTIONS. You can adjust the engine's skill level and contempt, or have Stockfish automatically tweak the settings for strongest play. Many crashes are now fixed as well. We hope you enjoy using Stockfish 2 for Mac. Please help us out and leave a rating on the App Store if you like it. Thanks!

- Updated the Stockfish engine to Stockfish 5 Like Stockfish? An App Store rating really helps us out. Thanks for using Stockfish!

- Fixed crashes that would occur on OS X 10.8 - Updated Stockfish engine If you like Stockfish, please help us out by rating us on the Mac App Store! Thanks!