"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::ETF2L 6v6 Season 21/Premiership/Preseason]] [[Has team left::Wonderland]] OR [[Is finished::true]] [[Has tournament::ETF2L 6v6 Season 21/Premiership/Preseason]] [[Has team right::Wonderland]]</q>