Final Windows 64-bit release. Processing logic is retained from the Windows-tested candidate; version labels and release text are updated.
Source2Metal processes GAME sources (PGN, CBH, 2CBH) and BOOK sources (CTG sets, Polyglot BIN, optional opening-line PGN). The existing GAME selection and corrected PGN parser are retained. BIN remains RAW-only.
OVERLAY-PGN is optional. Put legal opening-line PGN in that directory beneath an input root, or use a .overlay.pgn suffix. In RAW + METAL mode, distinct complete canonical lines are appended to Metal.pgn with result *. Only exact full-line duplicates are removed. Prefixes of different retained lengths and different move orders remain. The RAW depth limit still applies. Overlay does not contribute GAME win/draw/loss statistics or book weights.
The package includes an original, freely reusable VoorbeeldOverlay.pgn and seven overlay guides: DE, EN, ES, FR, NL, RU and ZH. The example is active input if included in a scan. Remove it or move it outside the complete input tree before production or comparison runs. Its isolated test produces five final records from six input records.
Start with the multilingual HTML guide and OVERLAY-PGN/MANUAL_EN.txt. Source and reproducible tests are included separately; extract source only into a separate development directory, outside the production input tree. See BUILDING.md, LICENSE and THIRD_PARTY_NOTICES.md.
CTG format support remains incomplete: underpromotions and special pawnless symmetries are limited. CompleteCTG remains false. No engine evaluation or playing-strength guarantee is implied by legal-move validation.