{
  "url": "https://www.moonstonehq.com/articles/the-twin-problem",
  "slug": "the-twin-problem",
  "title": "The Twin Problem: The Cards That Fool Every Scanner",
  "summary": "Two cards, one artwork, prices 10x apart, and the only difference is a set code smaller than your fingernail. Inside the identification problem nobody in card tech talks about, and the loop that took our binder scanner from 66.7% to a repeated 15 of 15.",
  "section": "Methodology",
  "published": "2026-08-27",
  "readMinutes": 8,
  "publisher": "moonstone",
  "findings": [],
  "tables": [
    {
      "title": "Twin classes we test against, with real August 2026 prices",
      "columns": [
        "Twin pair",
        "Separator",
        "Price gap"
      ],
      "rows": [
        {
          "Twin pair": "[Gardevoir EX, Steam Siege 78](/card/xy11-78) vs [116](/card/xy11-116)",
          "Separator": "collector number",
          "Price gap": "$5.00 vs $107.59"
        },
        {
          "Twin pair": "[Fossil Articuno 2](/card/base3-2) vs [17](/card/base3-17)",
          "Separator": "holo layer only",
          "Price gap": "holo commands the premium"
        },
        {
          "Twin pair": "[151 Ekans plain](/card/sv03.5-023) vs Poke Ball pattern",
          "Separator": "texture overlay",
          "Price gap": "pattern variant premium"
        },
        {
          "Twin pair": "VMAX Climax alts vs VSTAR Universe reprints",
          "Separator": "set code in the footer",
          "Price gap": "different markets entirely"
        },
        {
          "Twin pair": "[Paldean Fates](/set/paldean%20fates) 114/091 vs 014/091",
          "Separator": "one digit, often occluded",
          "Price gap": "secret rare vs common"
        }
      ]
    }
  ],
  "charts": [],
  "sections": [
    "Why twins break naive scanners",
    "How we got to 15 of 15 on composite photos"
  ],
  "method": [
    "Twin cases and scores from the binder and showcase accuracy loop of August 26, 2026: synthetic pages composed from the certified regression corpus, scanned through production, with the 159-case raw and slab regression gate run twice after every scanner change. The 66.7% baseline is 18 of 27 pockets across three synthetic three-by-three pages; the closing score is 15 of 15 on three consecutive fresh draws; the gate figure is 159 of 159 on all four rounds that certified the one scanner change the loop shipped. Prices are TCGplayer market and verified eBay sold medians pulled August 2026. RECHECKED 2026-09-22: the two Steam Siege Gardevoir EX prints now read $5.08 and $107.47 against the $5.00 and $107.59 printed here, and the Fossil Articuno pair $80.06 holo against $10.35 non-holo. The scanner has since been certified again, five consecutive rounds of a 26-case error suite plus the 159-case gate twice, on September 3, 2026."
  ],
  "terms": "Figures are moonstone's own recorded measurements, dated as published. Quote them with the population stated beside them. The article at `url` is the human form of this file."
}