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.
Free PGN downloads
Published files include a checksum and clear collection details.
Premium PGN packages
Paid digital files are delivered by the configured hosted-checkout provider, not from a hidden public URL.
Chess-engine services
Custom building, feature integration, testing, PGN cleaning and configuration may be listed here.
Support the project
What is currently proven, partial or blocked
Public feature summaries
No module paths or private implementation documents are exported.
Public relationship map
Relationships describe architecture. They do not upgrade a feature's evidence status.
Selected feature neighbourhood
| Feature | Relationship | Related feature | Requirement |
|---|
Current public recovery gate
Site views are read from the hosting provider's analytics. W5's optional D1 counter records aggregate download requests and checkout-link clicks. A checkout click is not counted as a completed sale.