OCN 1.1.0 — fully resolved transposition catalogue

OCN 1.1.0 — fully resolved transposition catalogue

Release notes (draft — tag not yet created). Docs-only record;
no tag/release/upload accompanies this document.

• Proposed release: OCN 1.1.0 — fully resolved transposition catalogue
• Proposed tag: ocn-1.1.0 (minor bump — first slug-rename; slug
  identity is not guaranteed stable across this boundary)
• Target commit: current main (the release-cycle head; this
  notes commit or its successor)
• Previous release: ocn-1.0.3 (dd2abd3)

Summary

The transposition layer is fully resolved: every duplicate-FEN
group in the catalogue is now classified.

• 0 unresolved duplicate-FEN groups (was 116 at the start of the
  post-0.2 cleanup; 31 at the start of this push series).
• QID Miles/Petrosian slug-migration applied — the mislabelled
  a3/Nc3 Kasparov-Petrosian subtree was re-homed under
  E.QID.Pet.KPe (OCN's first slug-rename).
• Nimzo Bot/Kmo naming fixed — E.Nim.Sml.Kmo (spurious
  "Kmoch") → transposes_to E.Nim.Sml.Bot, relabelled "a3 Move
  Order"; "Kmoch" stays at 4.f3 (E.Nim.Fou), per Lichess E20.
• same_as / transposes_to contract unchanged — same two
  resolution channels, same semantics.
• Schema unchanged — 14-column catalogue, 13-column
  openings.parquet (incl. canonical_ocn1, zobrist).

Metrics (at the release head)

metric	value	vs ocn-1.0.3
catalogue rows	5,899	(1.0.3 baseline)
duplicate_groups	124	—
resolved_groups	124	—
unresolved_groups	0	down from the long-tail
multiple_canonical_groups	17	grew via the same_as programme
schema columns	14 (catalogue) / 13 (parquet)	unchanged

Compatibility / breaking note

⚠️ This is OCN's first slug-rename. Slug identity is not
guaranteed stable across release tags — ocn-1.1.0 establishes that
precedent.

• 10 canonical OCN slugs changed: E.QID.Mil.MLn.* → E.QID.Pet.KPe.* (the QID Kasparov-Petrosian subtree), and the
  duplicate E.QID.Mil.MLn was deleted.
• No FEN / moves_uci / zobrist / schema change for those
  positions — only the slug identity (and canonical_name
  "Miles" → "Kasparov-Petrosian") moved.
• Consumers pinning E.QID.Mil.MLn* slugs must update to the
  E.QID.Pet.KPe.* names. Position-lookup consumers joining on
  FEN/zobrist are unaffected.

Assets (candidate — sha256)

Regenerated against the migrated catalogue; local candidates pending
upload at tag time.

asset	size	sha256
ocn-1.positions.tsv	1,475,677 B	0e78c315c62b1c37a7267b5df3c82f98e1af4e1ae0dbe8e9d47fc68211d89d7d
openings.parquet	369,663 B	a9180bfcd4fee272f0a9a76e866ffbe4ca2311ea68f373b435a5aff75209a5c2
_efcdb_manifest.json	328 B	a8aa50e904328e240290c1f17c56578a3c71875629f953b901ff551ca4ede9f6

_efcdb_manifest.json: efcdb_version 1.3, rows 5899,
zobrist_variant polyglot-v1.0, source ocn-1.1.0-candidate-<commit>. Regenerate fresh at tag time if
the head moves; do not reuse ocn-1.0.3 checksums.

Downstream (chess-parquet)

The efcdb-cli openings producer was run against the migrated
catalogue and smoke-tested:

• openings.parquet rows 5,899; schema unchanged (13 cols);
  canonical_ocn1 rule 0 violations; transposes_to 112,
  same_as 34; distinct zobrist 5,765, 124 multi-row zobrist
  groups (= duplicate_groups).
• QID migration absorbed cleanly: 0 E.QID.Mil.MLn*, 10
  E.QID.Pet.KPe.* in the parquet — no producer code change.
• cargo test -p efcdb-openings -p efcdb-core → 15 + 10 passed.

Upgrade guidance (from ocn-1.0.3)

• If you pinned ocn-1.0.3, expect the QID slug names to change
  on upgrade (E.QID.Mil.MLn.* → E.QID.Pet.KPe.*); update any
  hard-coded slug references.
• canonical_ocn1 is still computed by the transposes_to rule
  (canonical_ocn1 = transposes_to if set, else ocn1).
• same_as semantics are unchanged — symmetric co-canonical
  pairs (17 groups), still joined many-to-one on zobrist downstream.
• Nimzo: the depth-3 Sämisch E.Nim.Sml.Kmo is now "a3 Move Order"
  (transposes to E.Nim.Sml.Bot); "Kmoch" is E.Nim.Fou (4.f3).

Open follow-ups (NOT in this release)

• E.Nim.Rub.Kmo's "Kmoch" is the same artifact as the fixed Nimzo
  case — a cosmetic relabel for a future pass (does not affect
  resolution counts).
• E.Nim.Sml.Kmo.MLn parent-chain quirk (cosmetic).

Both are documented in
nimzo-botvinnik-kmoch-apply-preflight.md;
neither blocks the release.