The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
The point of trueskill is getting you to a 50% win rate. If you only play one map, then you get the rating that gets you a 50% win rate there. Your idea just makes it less efficient at accomplishing its intended goal and kinda just makes it easier for people to do some variation of smurfing.
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