When the OP votes to close own question as a duplicate, immediately close the question
3685
Confirming that my own question is a duplicate by voting to close should have immediate effect
146187
What to do when the OP mutilates their own question?
105704
Question closed as duplicate with  and also shown as "Possible duplicate"
133576
Should we reword the closure text for duplicate questions?
9251
Do you delete your own answer when it's a duplicate?
146037
deleting an answer as others poured the same quickly
22375
Allow another close vote after retraction
78861
Why are there two separate boxes about duplicate questions?
135386
Should bug-report/feature-request *questions* that duplicate Grab-bag *answers* be closed as duplicates?
47551
Allow the author to delete their own question after closure, if other rules permit it
118585
Voting to close my own question confusingly acts as if I'm not me
136265
Recover Close votes if asker deletes their own question
18509
Does the new guidance on duplicate questions suggest closing a question as duplicate, if the original answers the OP's question?
69130
Cannot vote to close immediately after edit
112391
How should one respond to "duplicate answer" flags?
139852
Dealing with suggested edits on question to be closed as duplicate
114835
Why don't I get credit for closing one of my own questions as a duplicate