In World of Tanks,
There is a number of maps and when you want to play the match making system simply assign you one. It seems to be not totally random. For exemple, when you play tier 1 or 2 tanks, you will often get some maps that you simply won't get at all while playing tier 5 or 6.
How does the Match making pick the map you will play on? Is it chosen whit the tank's tiers of the players? Does it depends on the number of artilery or some weird if statements like this?