Definition
A search quality assessor (asessor) is a contracted human rater who evaluates search results against detailed guidelines and rates them for relevance and quality. Both Yandex and Google employ large distributed pools of these raters.
They do not directly change any specific page's ranking; their aggregated judgements are training and evaluation data - used to teach machine-learned ranking models what "good" looks like and to measure whether an algorithm change improved or worsened result quality before it ships.
The rating guidelines are the closest thing to an official statement of what the search engine is trying to reward. Google's publicly available Search Quality Rater Guidelines describe concepts like E-E-A-T, Your-Money-or-Your-Life topics, and "Needs Met", and Yandex's assessors work from an analogous internal rubric.
In context
iGaming sits squarely in the highest-scrutiny category for quality rating. Gambling involves people's money and can cause financial harm, so it falls under Your-Money-or-Your-Life treatment in Google's guidelines, where raters are told to apply the strictest standards for trust, accuracy, and the reputation and expertise of the site and its authors.
A page that a rater would see as anonymous, thin, inaccurate, or reputationally questionable drags the training signal against sites like it.
The practical use of this is to treat the rater guidelines as a design brief. For an iGaming affiliate that means: clear authorship by people with demonstrable expertise, visible editorial standards and fact-checking, accurate and current information on odds, bonuses and terms, prominent responsible-gambling and licensing information, a checkable site reputation, and content that genuinely meets the query rather than routing straight to an affiliate link.
You cannot influence an individual rater, but you can build the site that the aggregate of them, and therefore the algorithm trained on their work, is meant to favour.
Worked example
Before a broad core update, both search engines run rater studies comparing the old and new results. An affiliate site with named expert authors, transparent review methodology and strong responsible-gambling content is the kind of result raters mark as high-quality for gambling queries, and it tends to gain in updates that raise the weight of those signals; an anonymous thin competitor tends to lose.
Related terms
Frequently asked questions
Browse more iGaming terms in our glossary.
← Back to glossary