"Query string" is a predefined property that describes the conditions of the query as a string and is provided by Semantic MediaWiki. This property is pre-deployed (also known as special property) and comes with additional administrative privileges but can be used just like any other user-defined property.
<q>[[Is finished::true]] [[Has tournament::ESEA Season 20/Invite]] [[Has team left::woodpig]] OR [[Is finished::true]] [[Has tournament::ESEA Season 20/Invite]] [[Has team right::woodpig]]</q>