Schach III UCI - current package build 1.03

Native UCI chess engine based on the original 68000 program by Thomas Nitsche and Elmar Henne (1984).

Downloads

All packages contain only the executable chess engine and a short README. No ROM files and no source code are included.

Native UCI Permanent Brain support with Ponder, go ponder and ponderhit
Reliable interruption of pondering through stop, new-game and quit commands
Optional UCI protocol logging with three levels: Off, Important and All; the Important level omits the very frequent currmove lines
Cross-platform builds for Linux x64, Linux ARM64, macOS Apple Silicon and macOS Intel

Earlier changes included:

Optional Hash Search mode with a configurable transposition table; original mode remains the default
Hash size, clear-hash command and UCI hashfull reporting
Improved root-move ordering and UCI principal-variation output between iterations
Configurable maximum search depth up to 64, including the historical selective-search structure
Internal opening book integrated with permission from Ossi Weiner
Further corrections to mate-distance reporting, stop/bestmove, FEN handling and time controls

Windows x64: Clang 22.1.8, -O3, Full LTO, weighted PGO, statically linked
Linux and macOS: Clang/Apple Clang, -O3, ThinLTO
Every published platform was built and regression-tested by the private GitHub Actions workflow
No compiler or third-party runtime is required on Windows

Original 68000 program by Thomas Nitsche and Elmar Henne (1984); opening book by Ossi Weiner; AI-assisted C/UCI port.

The stable public links above contain no version number. The underlying Git tag remains v1.02 while the current downloadable package build is 1.03.