Chess Engine Feature Vault

Engine History and Evidence

A curated public record of preserved chess engines, SQL systems, companion utilities and production tools. Status labels distinguish proven controls, validated builds, candidates and experimental work.

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6 curated public project records
Evidence-led status is separated from release availability
Private by default no private binaries or engineering paths are exposed

Chess engine

Obsidian 17 - July 12 Control

PROVEN CONTROL

Established competitive control. Proven configuration used 12 physical cores on the Ryzen 9 9900X.

Evidence status
Proven
Release status
Private reference control
Architecture
AVX-512 PGO; BMI2
Build computer
Needs confirmation
Source preservation
Modified and upstream source preserved
Public download
No

Chess engine

Onyx 26

VALIDATED CURRENT CANDIDATE

Final PGO builds plus Stage 0 through Stage 5 evidence. Current testing reported no exceptions.

Evidence status
Validated
Release status
Current private candidate
Architecture
AVX-512 PGO; BMI2 PGO
Build computer
Ryzen 9 9900X
Source preservation
Complete source, upstream control and staged patches preserved
Public download
No

SQL chess-engine system

Zobrist SQL 2907

VALIDATED DEVELOPMENT SYSTEM

Own learning, opponent comparison, provenance, trusted instant moves, SQL book and Onyx feature integration.

Evidence status
Validated
Release status
Private predecessor system
Architecture
AVX-512; BMI2
Build computer
Ryzen 9 9900X
Source preservation
Complete source and stage history preserved
Public download
No

PGN-to-SQL companion tool

Zobrist SQL PGN Importer v0.1

VALIDATED COMPANION TOOL

Imports opponent PGNs into the SQL database while recording duplicates and provenance.

Evidence status
Validated
Release status
Private supporting utility
Architecture
Windows executable; Python source
Build computer
Ryzen 9 9900X
Source preservation
Python source and import reports preserved
Public download
No

Experimental chess engine

Stockfish 22 DrawGuard

VALIDATED EXPERIMENTAL FEATURE BUILD

Designed to prevent premature Fritz draw offers by controlling the displayed evaluation without changing search.

Evidence status
Validated
Release status
Private experiment
Architecture
AVX-512 PGO; AVX-VNNI PGO
Build computer
Ryzen 9 9900X
Source preservation
Control source, modified source and checksums preserved
Public download
No

PGN processing and validation tool

Syzygy PGN Clean Correct

VALIDATED PRODUCTION TOOL

Includes Syzygy correction, seven-piece truncation, resignation checking, engine final checks, human filtering and daily reports. PGN Definitive Cleaner 1.5.3 is preserved as an earlier version.

Evidence status
Validated
Release status
Current private production tool
Architecture
Windows executable; Python source
Build computer
Ryzen 9 9900X
Source preservation
v3.15 and v3.16 source/build projects preserved
Public download
Not yet reviewed