Make sure you have a good reason for the check. It will only be accepted to counter vandalism or disruption to Wikimedia wikis. Valid reasons include needing a block of the underlying IP or IP range, disruptive sockpuppetry, vote-stacking, and similar disruption where the technical evidence from running a check would prevent or reduce further disruption.
Be specific in your reasons. Ambiguous or insufficient reasons will cause delays. Explain the disruption and why you believe the accounts are related, ideally using diff links or other evidence.
Make sure there are no local checkusers or policies.
Reason(s): Tubus voted in favor of MrArifnajafov in voting for removal of his admin flag. And according to rules it is forbidden for candidates to vote for themselves. I ask you as a bureaucrat of azwiki.--Sortilegus (talk) 15:03, 30 September 2014 (UTC)
Why do you think they are the same person? Ruslik (talk) 19:02, 30 September 2014 (UTC)