$ cat cards/estadio-das-dunas-natal-21-2014/faq/trading-faq-54.md
How does the swap matcher find matches for the Estádio das Dunas - Natal card?
card: Estádio das Dunas - Natal 21 (2014) · category: trading
[Concise Summary]
The swap matcher compares your trading partner's duplicates against your missing list. If a match contains 21, the tool highlights it in the trades ledger.
[Structured Data Grid]
| Match Method | Intersectional Matrix |
| Match Indicator | Green Highlight for 21 |
| Algorithm Accuracy | 100% deterministic |
| Complexity Class | O(N) search lookup |
Detailed Investigation & Analysis
The matching logic runs checklist matrix intersections. It reads partner duplicate strings and filters for codes present in your missing list. If a match matches 21, the swap is highlighted.
Additional notes for collectors: Ensure checklist entries are verified before confirming trades. Standard trade ratios are calculated relative to card popularity.
[Album Context Specs]
| Card Code | 21 |
| Official Name | Estádio das Dunas - Natal 21 (2014) |
| Estimated Value | $1.30 USD |
| Album Section | Stadiums (2014) |
| Completion Mode | Required Checklist Item |