Sorry doggy, I wrote a reply last night and I thought I had posted it, but seems not. I shall try to regurgitate it.
Hedja - even if the multiaccounts were named the same, it would still be possible to cheat, so that doesn't change anything i guess.. after triple pick tournament i lost all trust in people playing fair here..
If someone were to create 6 new accounts with names not linked to anything (for example 1,2,3,4,5,6) and then told 6 random people what the email and what the password was, and then created a 3vs3 of 1 + 2 + 3 vs 4 + 5 + 6, then you could get team-mates who do not know who is who, and play without talking. I would also suggest no talking in public chat, as then they no-one knows who anyone is, from tell-tale signs of how they say hello, if they complain (about luck :) ) so everyone is none the wiser.
However you could just play games with people's main accounts so they know who they are and expect them to not say anything, the reason the choose your opponents picks tourny didn't work was because there were too many noobs, who to be honest don't care if they break the rules some random guy said.
My answer earlier was better, but can't be bothered to write that much again.
Also if we are using main accounts I will pair up will Doggy if he will take me :)