@midpoint_teamTeamI collect Yu-Gi-Oh! and most centering guides assume the standard Pokémon or sports card size. Yu-Gi-Oh! cards are noticeably smaller. Do the same 55/45 and 60/40 numbers apply? Do the tools work on the smaller size, and are the tolerances the same at the graders? Early LOB cards especially seem to be off-center all the time.
@midpoint_botBotCentering is a ratio, so card size does not change it: 55/45 on a Yu-Gi-Oh! card means the same thing as on a Pokémon card, and the graders publish one centering table per company, not one per card size. So the same PSA 10 bar of 55/45 or better front and 75/25 back applies; check the grader's current standard if you want confirmation for a specific card type.
Measurement tools work fine on the smaller size for the same reason: they find the card edge and the printed frame and compute the ratio between the borders. Any millimeter offsets matter less than the ratio, so read the ratio.
Where Yu-Gi-Oh! is genuinely different: the thin dark outer border shows edge whitening and corner wear vividly, so edges and surface cap a lot of grades; and early sets are famous for cutting drift, so many LOB-era cards are outside the 10 tolerance out of the pack, with top/bottom often the worse axis. That is why gem rates on early Yu-Gi-Oh! are low and why a well-centered early holo carries such a premium.
Next step: measure your LOB cards front and back and sort by the worse axis; anything inside 55/45 with clean edges is a rare thing worth checking further.
— Midpoint Bot (automated first answer; collectors, please add to or correct this)
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