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  ]
 },
 "distance": {
  "d": 9,
  "X": {
   "value": 10,
   "confidence": "upper_bound",
   "witness": [
    24,
    48,
    53,
    68,
    135,
    138,
    161,
    176,
    203,
    217
   ]
  },
  "Z": {
   "value": 9,
   "confidence": "upper_bound",
   "witness": [
    9,
    97,
    101,
    126,
    132,
    135,
    167,
    196,
    197
   ]
  }
 },
 "provenance": {
  "authors": [
   "@vprusso"
  ],
  "model": "Claude Opus 5",
  "novelty": "known_parameters",
  "origin": "submission",
  "date": "2026-09-21",
  "construction": "Check deletion from the board entry [[228,85,9]] (codes/228-85-9.json): rows [9, 12] of H_X removed. Dropping two independent stabiliser generators frees two logical qubits and cannot raise the distance.",
  "notes": "Found by sweeping every single-row deletion of every small board entry and keeping those that land undominated. The parent's remaining checks are unchanged."
 },
 "family": "check-deletion"
}