Quantities
| P4876 | number of records | 500 |
| P2429 | expected completeness | ... | Q21873974 (eventually complete) | eventually complete |
| P1793 | format as a regular expression | String | [A-E]\d{2}(–[A-E]\d{2})? | ??? |
| P31 | instance of | ... | Q19847637 (Wikidata property for an identifier) | Wikidata property for an identifier |
| P31 | instance of | ... | Q27698571 (Wikidata property related to chess) | Wikidata property related to chess |
| P2302 | property constraint | ... | Q19474404 (single-value constraint) | single-value constraint |
| P2302 | property constraint | ... | Q21502410 (distinct-values constraint) | distinct-values constraint |
| P2302 | property constraint | ... | Q21503247 (item-requires-statement constraint) | item-requires-statement constraint |
| P2302 | property constraint | ... | Q21503250 (subject type constraint) | subject type constraint |
| P2302 | property constraint | ... | Q52004125 (allowed-entity-types constraint) | allowed-entity-types constraint |
| P2302 | property constraint | ... | Q53869507 (property scope constraint) | property scope constraint |
| P3254 | property proposal discussion | Url | None | ??? |
| P3303 | third-party formatter URL | String | https://chessopenings.com/eco/$1/ | ??? |
| P1629 | Wikidata item of this property | ... | Q108335666 (ECO code) | ECO code |
| P1855 | Wikidata property example | ... | Q645666 (Larsen's Opening) | Larsen's Opening |
| P1855 | Wikidata property example | ... | Q678245 (Pirc Defence) | Pirc Defence |
| P1855 | Wikidata property example | ... | Q1290671 (Ruy Lopez) | Ruy Lopez |
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