Dont ever wall in against terran, thats just asking to be harassed to death by marauders (or reapers). It's much better to build tight to your nexus which makes it easier to manage your base if you do get pressured early game.
plus early game a couple of tanks, marines and a viking at the low ground of the entrance can kill your gateways+pylons+your army without breaking a sweat. cant even count how many protoss players i've beat this way.
Kinda, I think lots of things are taken into account. Such as your APM, your wins and losses, length of games, opponents played etc.
from my experience the most important is winning against favored players. when you are doing well the system will put you against a player from a higher league. win that a couple of times and you get promoted.
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. It's much better to build tight to your nexus which makes it easier to manage your base if you do get pressured early game.

but I love this game It's so addictive I'm normally in bed at 11pm but I was still playing at 1am 
), I have a new strat for pvz which is working quite nicely now