V Chess Engine Feature VaultPublic Shop, Analytics and Free Engine Edition - W6
Public engineering catalogue and shop

Chess-engine features, PGN collections and specialist services.

This edition keeps private source archives, patch records, databases and local paths offline. Payments use hosted checkout pages; this website does not receive or store card details.

0Public features
0Mandatory core features
0Public relationships
#0Protected checkpoint
Free PGN archive

Free PGN downloads

Published files include a checksum and clear collection details.

Free chess engine

Zobrist SQL 0108 AVX2

Free Windows x64 UCI chess engine with both Zobrist SQL databases and complete corresponding GPL source.

Zobrist SQL 0108 AVX2 - Free download

Built from Stockfish development source c5aef2bf and modified by Clive Spencer.

Includes Stage 7H Syzygy Ready Warmup, instant Syzygy moves, Syzygy result display, SQL own learning, opponent database comparison and the SQL opponent book.

Package: AVX2 engine, zobrist_opponents.db, zobrist_own.db, documentation, checksums and corresponding source.

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Premium collections

Premium PGN packages

Paid digital files are delivered by the configured hosted-checkout provider, not from a hidden public URL.

Specialist work

Chess-engine services

Custom building, feature integration, testing, PGN cleaning and configuration may be listed here.

Support

Support the project

Evidence state

What is currently proven, partial or blocked

Feature catalogue

Public feature summaries

No module paths or private implementation documents are exported.

Dependency explorer

Public relationship map

Relationships describe architecture. They do not upgrade a feature's evidence status.

Selected feature neighbourhood

FeatureRelationshipRelated featureRequirement
Active recovery

Current public recovery gate

Analytics meaning

Site views are read from the hosting provider's analytics. W6's optional D1 counter records aggregate download requests and checkout-link clicks. A checkout click is not counted as a completed sale.

Engine archive

Engine History and Evidence

Explore six curated records covering proven controls, validated engines, SQL systems, companion tools and production utilities.

Open engine history and evidence

Latest processing evidence

Daily Playchess Report — 2 August 2026

Syzygy PGN Clean Correct v3.16 processed 2,833 games, wrote 2,545, corrected 45 unique games and completed 1,984 engine searches with no watchdog timeouts or worker restarts.

Open the daily report