$ cat cards/host-city-posters-head-coach-poster-21/faq/trading-faq-54.md
How does the swap matcher find matches for the Host City Posters Head Coach card?
card: Host City Posters Head Coach Poster-21 · category: trading
[Concise Summary]
The swap matcher compares your trading partner's duplicates against your missing list. If a match contains Poster-21, the tool highlights it in the trades ledger.
[Structured Data Grid]
| Match Method | Intersectional Matrix |
| Match Indicator | Green Highlight for Poster-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 Poster-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 | Poster-21 |
| Official Name | Host City Posters Head Coach Poster-21 |
| Estimated Value | $4.51 USD |
| Album Section | Host City Posters |
| Completion Mode | Required Checklist Item |