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Have I Been Pwned
Chess.com (2026) - 4,653,212 breached accounts
In August 2026, . The data contained 7.3M rows with 4.6M unique email addresses, along with usernames, names, countries and data relating to users' Chess.com accounts. Analysis of the data suggested it had been obtained by scraping. When loaded into HIBP, 99% of the email addresses had already appeared in previous data breaches, further supporting the scraping theory. millions of records allegedly sourced from Chess.com were posted online Read more about scrapes and data breaches.