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Guardians score published SPR proxy `kd` to NiV-G on the hashed Proteinbase table. They do not run SPR or neutralization.\n\n## Challenge details\n\nAdaptyv's Nipah Binder Competition asked designers to bind Nipah virus glycoprotein G, a tetramer. 1,196 designs were tested. Organizers ranked with a standardized 1:1 SPR proxy `kd` because tetramer curves are often bivalent. They also ran ephrin-B2 neutralization on a subset. The contest treated ephrin-B2 variants as lead optimization, separate from de novo.\n\nThis bounty purchases the **de novo track**, not the ephrin lead-opt ranking. It does not purchase a new wet-lab campaign. HuggingFace `yk0/proteinbase_interactions` is not this snapshot.\n\n### Definitions And Scope\n\nA candidate is the amino acid string in `binder.fasta`. A match is a Proteinbase row whose `sequence` equals that string. Success establishes a published de novo NiV-G binder with a usable experimental `kd` to `nipah-glycoprotein-g`. It does not establish a new physical sample or a neutralization result.\n\nNovelty uses the collection's computational `seqidentity` evaluation, not a live UniRef50 search.\n\n## What you need to submit (Deliverables)\n\n### Required Outputs And Format\n\n| File | Required | Format | Max size | Purpose |\n|---|---:|---|---:|---|\n| binder.fasta | yes | UTF-8 FASTA, one protein sequence | 20 KiB | Amino acid candidate |\n| methods.md | yes | UTF-8 Markdown | 100 KiB | Disclose `name`, `author`, and `designMethod` |\n\nbinder.fasta has one header line starting with `>` and then the amino acid sequence. Ignore the header for matching. Concatenate subsequent non-header lines and strip ASCII whitespace. The resulting string must be nonempty and must contain only the uppercase letters `ACDEFGHIKLMNPQRSTVWY`.\n\nmethods.md must contain the matched row's `name` and `author` as case-sensitive contiguous substrings. If that row's `designMethod` is nonempty, methods.md must also contain that `designMethod` string. It must contain this exact sentence, including the period:\n\n`No new laboratory SPR was performed for this Submission.`\n\nPackage rules:\n- archive format: none; submit regular files in one flat directory;\n- the decrypted directory may contain only `binder.fasta` and `methods.md`.\n\n## Input Files References\n\n| File | Why it is needed | How to get it | SHA-256 content hash |\n|---|---|---|---|\n| nipah_collection.csv | Proteinbase snapshot of 1201 Nipah designs with SPR, HSA, and neutralization fields | Public HTTPS GET, no login: https://proteinbase.com/api/proteins/download?collectionId=019be357-ae36-ec95-4bc6-9db0046b0600&slug=nipah-binder-competition-results | `e6399877a322861476649ab145f6761b171c309142284b3ff10cf5994474f37f` |\n\n### Access And Known Limitations\n\nThe snapshot is 13,590,596 bytes. Guardians fetch it and check SHA-256 of the raw bytes. Parse with UTF-8-SIG. `evaluations` is a JSON array. Kinetic-curve objects inside JSON may contain URLs; do not fetch them. Missing access or a hash mismatch blocks judgment.\n\n## Acceptance Criteria\n\n### Pass/Fail Checks\n\nA Submission is valid only when:\n\n1. The decrypted directory contains exactly `binder.fasta` and `methods.md`.\n2. Size limits: fasta ≤ 20,480 bytes, methods.md ≤ 102,400 bytes.\n3. The FASTA sequence passes the alphabet rule.\n4. Exactly one data row has `sequence` equal to that FASTA sequence.\n5. That row's `author` is nonempty. Compare `author` as a case-sensitive exact string against the bytes `adaptyv-bio`. Do not lowercase, Unicode-casefold, or strip. If `author` equals `adaptyv-bio`, the Submission is invalid. `Adaptyv-Bio` or `ADAPTYV-BIO` are not that exclusion.\n6. Prefix tests on `name` are case-sensitive exact byte prefixes. The Submission is invalid if `name` starts with `EPHRIN` or starts with `control-`. Do not lowercase. `ephrin`, `Ephrin`, and `Control-` are not those prefixes.\n7. Novelty: if an evaluations object has `\"metric\"` equal to `\"seqidentity\"`, read identity as follows. If `value` is a JSON number, use it. If `value` is a JSON object, use that object's `value` field when it is a number. If that number is present and ≥ `0.75`, the Submission is invalid (lead-opt / insufficient edit distance). Missing `seqidentity` does not fail this check.\n8. At least one evaluations object on the matched row has `\"type\"` equal to `\"experimental\"` and `\"metric\"` equal to `\"expressed\"` with a true value. Treat JSON `true`, boolean true, and the strings `true` and `True` as true.\n9. At least one evaluations object on the same row has `\"type\"` equal to `\"experimental\"`, `\"metric\"` equal to `\"binding\"`, `\"target\"` equal to `\"nipah-glycoprotein-g\"`, and a true value using the same true test. `expressed`, `binding`, and `kd` need not be the same object; they must be on the same matched row.\n10. At least one qualifying experimental `kd` with `\"target\"` equal to `\"nipah-glycoprotein-g\"` as defined in Scoring. A non-qualifying `kd` object does not satisfy this check.\n11. methods.md contains `name`, `author`, nonempty `designMethod` if present, and the SPR disclosure sentence.\n\nDo not use `kd` objects whose target is `human-serum-albumin`. Neutralization labels are not used to rank.\n\n### Scoring And Calculations\n\nCollect every evaluations object on the matched row with `\"type\"` equal to `\"experimental\"`, `\"metric\"` equal to `\"kd\"`, and `\"target\"` equal to `\"nipah-glycoprotein-g\"` whose `value` parses with Python 3 `float()` as a finite number strictly greater than `0.0` and at most `1.0`. The score is the geometric mean of that full set:\n\n`math.exp(sum(math.log(kd_i) for kd_i in kds) / len(kds))`\n\nIf the qualifying set is empty, or `math.exp` or `math.log` raises `OverflowError` or `ValueError`, the Submission is invalid. Lower is better. Do not convert units. Do not rank by neutralization, HSA, or `boltz2_ipsae`.\n\n### Missing, Invalid, And Conflicting Results\n\n- No matching sequence, mixed matches, organizer `adaptyv-bio`, ephrin/`control-` names, or `seqidentity` ≥ 0.75: invalid.\n- HSA-only `kd` without NiV-G `kd`: invalid.\n- Unavailable fetch is an operational blocker.\n\n### Evidence And Provenance\n\nThe trusted producer is Proteinbase collection `nipah-binder-competition-results` identified by SHA-256. Link by exact `sequence`. This is historical analysis.\n\n## How is the winner selected?\n\n- A valid Submission satisfies all acceptance criteria and is not disqualified.\n- If multiple Submissions are valid, the Submission with the lowest NiV-G geometric-mean `kd` wins. Binary64 ties go to the lowercase Solver address that sorts first.\n- If no Submission is valid, the outcome is `no_valid_submission`.\n\n## Disqualification Conditions\n\n- required artifacts are missing after successful retrieval and decryption;\n- an artifact is corrupt or cannot be inspected in its required format;\n- the decrypted directory contains any filename other than `binder.fasta` and `methods.md`.\n\n## Out Of Scope\n\nEphrin-B2 lead optimization and organizer controls are already rejected by Pass/Fail Checks 5–7. Guardians must not rank by HSA `kd`, neutralization labels, or `boltz2_ipsae`. methods.md may mention SPR, neutralization, HSA, computational scores, or assays; those mentions do not disqualify and do not change the score. Guardians still score only the hashed NiV-G `kd` set. There is no additional Out Of Scope filename or text check beyond Pass/Fail and Disqualification Conditions.\n\n### Allowed Resources And Reuse\n\nPublished de novo Nipah designs may be submitted. Disclose `name` and `author`.\n\n## Guardian Verdict Instructions\n\nEach Guardian judges only submitted artifacts, this page, and the listed CSV. Do not run SPR. Do not fetch kinetic-curve URLs.\n\n### Evaluation Procedure And Limits\n\n1. Fetch `nipah_collection.csv` and check its SHA-256.\n2. Open binder.fasta and methods.md.\n3. Apply Pass/Fail Checks.\n4. Geometric-mean NiV-G `kd` only.\n5. Apply the winner rule.\n\nOne pass over 1201 rows is enough. 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