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Correct PSA 10 centering tolerance; encode the 5% leeway rule properly

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Verified the encoded rubric against psacard.com/gradingstandards directly
(the page 403s automated fetchers, so read via a real browser session,
clicking through all 14 grade-definition slides).

The app said '55/45 to 60/40 allows a 10'. PSA publishes a flat 55/45 for
a 10 -- and the app's very next line already said 60/40 allows a 9, so the
range was internally contradictory as well as over-lenient: a 58/42 card
would read as 10-eligible when PSA would cap it at 9.

The range appears to have been a garbled memory of a real rule the app
otherwise didn't encode at all: PSA grants a 5% leeway on front centering
minimums for cards grading 7 or better. The old text applied that leeway to
the 10 only and to no other grade. Now the published tolerances stand as
written and the leeway is stated once, for the grades it actually covers,
as grader discretion keyed to eye appeal rather than a hard second
tolerance -- so a borderline card gets a range instead of a confident
single grade.

Everything else checked out exactly: 9=60/40, 8=65/35, 7=70/30, 6=80/20,
5/4=85/15, 3/2=90/10, and back 75/25 for a 10 / 90/10 from 9 down.
PSA's 'Altered Authentic' designation also confirms the trimming guidance
added earlier (alterations -> no numeric grade).
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Barely Removable 2026-08-25 08:19:00 -07:00
parent 0cbeb26665
commit 811c16f334
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10
vision.py
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@ -365,13 +365,21 @@ PSA weighs four things. Assess each one separately:
- CENTERING: the ratio of the border widths on opposing sides. PSA publishes \
hard tolerances for this, applied to the FRONT (the back is judged far more \
leniently, 75/25 for a 10 and 90/10 from 9 downwards):
55/45 to 60/40 .... allows a 10
55/45 ............. allows a 10
60/40 ............. allows a 9
65/35 ............. allows an 8
70/30 ............. allows a 7
80/20 ............. allows a 6
85/15 ............. allows a 5 or 4
90/10 ............. allows a 3 or 2
PSA additionally allows a 5% LEEWAY on these front minimums for cards \
grading 7 or better — so a 10's 55/45 can stretch toward 60/40, a 9's \
60/40 toward 65/35, and so on up to a 7. That leeway is the grader's \
discretion and keys off overall eye appeal, not an automatic second \
tolerance: a card just past the published line is genuinely borderline \
rather than either automatically passing or automatically failing, so \
give the range at that boundary rather than a confident single grade. No \
leeway applies at 6 or below.
Both axes are judged and the WORSE one governs, so a card at 52/48 \
left-to-right but 70/30 top-to-bottom is a 70/30 card and caps at 7.
When a MEASURED CENTERING block is supplied, use those figures — they are \