# HEADPASS-X2b = the pack line's retrieval recommendation for format-v3 packs; X1 for format-2 packs

> Living preprint · as of 2026-10-25 · map node D-092 (decision) · interim record, not a final result.

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- [D-092] 2026-10-14 · HEADPASS-X2b = the pack line's retrieval recommendation for format-v3 packs; X1 for format-2 packs · why: Opus +0.066 (+0.043…+0.091), no harm on kit. · status: kept

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Read chapter 9, Knowledge packs: https://r4topunk.github.io/boar-research/research/packs.md

## Facts cited {#facts}

Resolve every [F-…] marker in https://r4topunk.github.io/boar-research/data/facts.json. Each line gives the claim, the number with its metric family, set and status, judge, n, seeds, CI, date and caveat.

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- [F-1059] X2b (neighbour + budgeted dense append) recommended as pack-line default when a format-v3 pack is installed (why: LEVER by frozen rule +0.066 Opus; no harm on kit) · date 2026-10-14 · caveat: outcome: Ported to lite tier (LITE5); not a bar lever
- [F-1070] HEADPASS-X2b = the pack line's retrieval recommendation for format-v3 packs; X1 for format-2 packs — why: Opus +0.066 (+0.043…+0.091), no harm on kit — outcome: X3 failed at step 0; X2b staged for after 10-20 (PR-2) · date 2026-10-14 15:38

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Cite as: r4to, independent researcher. RatLab — A Boar Research (2026), research record 1.0, as of 2026-10-25. Text and data CC BY 4.0. Fact ids or a link must travel with a quote. How to cite: https://r4topunk.github.io/boar-research/cite/ · https://r4topunk.github.io/boar-research/CITATION.cff.

AI-reviewed, not clinically reviewed. Nothing here is medical advice.