Is there a way to put someone in a black list, so they can't play with you again ?
4 Answers
In addition to ignoring the person, you could report them for "Unskilled Player". Unskilled player reports never go to the tribunal or result in a ban, but are only used for determining matchmaking [1].
This will not result in a blacklist, but will help to minimize the chance of them being randomly queued with you.
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I Correct the link @Toast Your made the best answer possible for this question. Thank you very much– MichelApr 9, 2012 at 16:26
There is the ignore list, but that only prevents people from talking with you as far as i know.
There is not a way so that you can never play with you again. However, the ignore list allows you to not see their pings and chat. But most forums I read concluded that it isn't a very refined nor foolproof method for doing so.