Download.

Installing

Open the disk image and drag Zugwunder into Applications. The app checks for updates itself and installs them after verifying the signature and checksum; nothing else needs to be set up.

Inside

• Solver, tactics trainer, play against the engine, board editor.
• A bundled copy of zugwunder-uci 1.1.13. The menu item “Install UCI engine in ~/bin” makes it available to other chess programs.
• German, English, French and Dutch.

• Zugwunder-1.1.15.dmg 8,913,687 bytes, published 2 November 2026 SHA-256 890aee3c34aee3846444cd751d556d6b18b5ecd25757218c605ae9d81f34fe77

Installations still named Mattlotse update themselves to Zugwunder automatically.

Installing

Open the disk image and drag Wolfgang into Applications. Wolfgang finds its bundled Zugwunder engine, a copy in ~/bin and installed engines such as Stockfish on its own; other engines can be added from the Engines tab.

Inside

• Play against an engine, engine against engine, two people at one Mac.
• Time controls from bullet to classical, evaluation bar, MultiPV lines, UCI console.
• Engine tournaments with opening suites, export as PGN, CSV and JSON.

• Wolfgang-1.0.17.dmg 6,155,386 bytes, published 2 November 2026 SHA-256 29d02fbb209f45fb2c7c35c15d15da3ef3f4866ab2b68670819aad210f60d7b9

Installing

Unpack the archive and copy the program wherever you keep engines, for example:

tar -xzf Zugwunder-UCI-1.1.13-macos-arm64.tar.gz
mkdir -p ~/bin && cp zugwunder-uci-1.1.13/zugwunder-uci ~/bin/

On Linux the file names end in linux-x86_64 or linux-aarch64; the programs are statically linked and need no libraries. x86_64 requires AVX2 (Intel from 2013, AMD Zen); aarch64 runs on 64-bit ARM such as a Raspberry Pi 4 or 5.

A quick test in a terminal:

printf 'uci\nisready\ngo movetime 1000\n' | ~/bin/zugwunder-uci

Then add ~/bin/zugwunder-uci as a UCI engine in your chess program (in the Finder’s file dialog, ⇧⌘G takes you to ~/bin). No command-line arguments are needed. If macOS refuses to start the program, remove the quarantine flag once: xattr -d com.apple.quarantine ~/bin/zugwunder-uci.

Recommended tournament settings

Threads 1 (or 4 for four-CPU lists), Hash 256, SyzygyPath to your tables, OwnBook false, Move Overhead 50 to 100. Each archive contains the README with all options, the calibration notes and check_uci.py, a protocol test you can run against the binary with Python 3.

• macOS, Apple silicon Download Zugwunder-UCI-1.1.13-macos-arm64.tar.gz, 884,036 bytes, signed and notarised SHA-256 7bc48808c0b9a56e5af7b7d26fa3684397f3751ce094b8bc5ef8635ac0e0e394
• Linux x86_64 (AVX2) Download Zugwunder-UCI-1.1.13-linux-x86_64.tar.gz, 22,409,589 bytes, static SHA-256 432262e96ed8312c1b25451f95eca5d8724f5b0a40b9f2a10fb0b83b7a399b93
• Linux ARM64 Download Zugwunder-UCI-1.1.13-linux-aarch64.tar.gz, 21,736,637 bytes, static SHA-256 4ad1308242fda71c2f89dccd52b30f72fa15d2ab2dec1e3aa115829abb062945

The Linux builds are cross-compiled on a Mac. Version 1.1.10 passed all protocol tests on an Ubuntu machine; this build has not been run on Linux before release. Windows is prepared in the build system but not yet available.

WebAssembly

The complete “Play Zugwunder” page: HTML, scripts, the Web Worker and the engine module (14 MB, 2.9 MB as Brotli). Unpack it into a folder on any web server; no server-side code is needed.

Tools for macOS

The programs behind the measurements: zugwunder-match plays engine matches with SPRT, zugwunder-tune tunes the hand-written evaluation, zugwunder-datagen produces training data, zugwunder-rating estimates a rating from match results, zugwunder-analyse lets a referee engine score positions, zugwunder-relabel re-scores them, and zugwunder-web is the browser engine’s command-line twin. All signed and notarised.

• WebAssembly 1.1.13 Download Zugwunder-WebAssembly-1.1.13.zip, 11,397,663 bytes SHA-256 be439cd507d5a43b53a6adfa3688143a27ca99811c7b90bab80cef6dbb1e5129
• Tools 1.1.13, macOS Download Zugwunder-Werkzeuge-1.1.13-macos-arm64.zip, 7,108,295 bytes SHA-256 28f842b1c4e3ecdb793b04747a9949e7bb8ddf7e5f433e83c4923131b1959e83