```json {"role": "dimension", "confidence": 0.85, "reason": "match_number is a low-cardinality (72 distinct) numeric code used to identify which match in a season/tournament. While it identifies matches, it's primarily used for grouping, filtering, and ordering matches (e.g., 'show all match 1s across seasons'). Not a true identifier for joining tables or uniquely identifying rows, as values repeat across seasons."} ```