Property talk:P9838

Documentation

• Start a query
• Current uses
• Statistics by class
• String length
• List of qualifiers
• Count

ECO code
alphanumerical identifier for an opening in the Encyclopaedia of Chess Openings

Represents	ECO code (Q108335666)
Data type	External identifier
Domain	chess opening (Q103632)
Allowed values	[A-E]\d{2}(–[A-E]\d{2})?
Example	Larsen's Opening (Q645666) → A01 Pirc Defence (Q678245) → B07 Ruy Lopez (Q1290671) → C77
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other external identifier Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Database reports/Constraint violations/P9838 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 317 Main statement 314 out of 500 (63% complete) 99.1% of uses Qualifier 3 0.9% of uses
Search for values

[create Create a translatable help page (preferably in English) for this property to be included here]

Single value: this property generally contains a single value. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P9838#Single value, SPARQL

Distinct values: this property likely contains a value that is different from all other items. (Help)

List of violations of this constraint: Database reports/Constraint violations/P9838#Unique value, hourly updated report, SPARQL (every item), SPARQL (by value)

Type “chess opening (Q103632)”: item must contain property “instance of (P31)” with classes “chess opening (Q103632)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P9838#Type Q103632, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P9838#Entity types

Scope is as main value (Q54828448): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P9838#Scope, SPARQL

Item “Portable Game Notation (P5286)”: Items with this property should also have “Portable Game Notation (P5286)”. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P9838#Item P5286, search, SPARQL