Grade a trading card using PSA, BGS, or CGC standards. Covers observation-first assessment (adapted from meditate's unbiased observation), centering measurement, surface analysis, edge and corner evaluation, and final grade assignment with confidence interval. Supports Pokemon, MTG, Flesh and Blood, and Kayou cards. Use when evaluating a card before professional grading submission, pre-screening a collection for high-grade candidates, settling condition disputes between buyers and sellers, or estimating the grade-dependent value spread for a card.
Assess and grade a trading card following professional grading standards (PSA, BGS, CGC). Uses an observation-first protocol adapted from the meditate skill to prevent grade anchoring — the most common grading bias.
Adapted from meditate Step 2-3: observe the card without anchoring to expected grade or market value.
Expected: A neutral starting state where the card is assessed purely on physical condition, not market expectations. Grade anchoring (knowing the value before grading) is the #1 source of grading inconsistency.
On failure: If bias feels sticky (a high-value card makes you want to see a 10), write down the bias explicitly. Externalizing it reduces its influence. Proceed only when you can examine the card as a physical object.
Measure the card's print centering on both faces.
PSA Centering Thresholds:
+-------+-------------------+-------------------+
| Grade | Front (max) | Back (max) |
+-------+-------------------+-------------------+
| 10 | 55/45 or better | 75/25 or better |
| 9 | 60/40 or better | 90/10 or better |
| 8 | 65/35 or better | 90/10 or better |
| 7 | 70/30 or better | 90/10 or better |
+-------+-------------------+-------------------+
BGS Centering Subgrade:
+------+-------------------+-------------------+
| Sub | Front (max) | Back (max) |
+------+-------------------+-------------------+
| 10 | 50/50 perfect | 50/50 perfect |
| 9.5 | 55/45 or better | 60/40 or better |
| 9 | 60/40 or better | 65/35 or better |
| 8.5 | 65/35 or better | 70/30 or better |
+------+-------------------+-------------------+
Expected: Numeric centering ratios for both faces with the corresponding grade/subgrade identified. This is the most objective measurement in the grading process.
On failure: If borders are too narrow to measure accurately (full-art cards, borderless prints), note "centering N/A — borderless" and skip to Step 3. Some grading services apply different standards for borderless cards.
Examine the card's surface for defects.
Expected: A detailed surface inventory with each defect located, described, and severity-rated. Factory vs. handling defects distinguished.
On failure: If images are too low-resolution for surface analysis, note the limitation and provide a grade range rather than a point grade. Recommend physical inspection.
Assess the card's edges and corners for wear.
Expected: Per-edge and per-corner condition assessment. The worst individual corner/edge typically limits the overall grade.
On failure: If the card is in a sleeve or toploader that obscures edges, note which areas couldn't be fully assessed.
Combine sub-assessments into the final grade.
Expected: A final grade with confidence level. For BGS, all four subgrades reported. The grade is supported by evidence from Steps 2-4.
On failure: If the assessment is inconclusive (e.g., can't tell if a surface mark is a scratch or dirt), provide a grade range and recommend professional grading. Never assign a confident grade with insufficient data.
build-tcg-deck — Deck building where card condition affects tournament legalitymanage-tcg-collection — Collection management with grade-based valuationmeditate — Source of the observation-without-prejudgment technique adapted for grading bias prevention