$ cat cards/moscow-21-2018/faq/trading-faq-54.md

How does the swap matcher find matches for the Moscow card?

card: Moscow 21 (2018) · 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	Moscow 21 (2018)
Estimated Value	$0.90 USD
Album Section	Host cities' posters (2018)
Completion Mode	Required Checklist Item