611K accounts from HLTV (hltv.org) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesNamesPasswordsUsernamesWebsite activity
In June 2016, the "home of competitive Counter Strike" website HLTV was hacked and 611k accounts were exposed. The attack led to the exposure of names, usernames, email addresses and bcrypt hashes of passwords.
Source: Have I Been Pwned (CC BY 4.0)