You need to take the results search with a grain of salt though. The sample size of people posting there is relatively small and people also post unreliable data (e.g. they forget to set the date correctly, they assume that they've been "rejected" before any actual notices). Plus, it's completely possible to post bogus results.
Apparently they conduct the admissions process in two phases. They interview everyone who makes it to the second phase so they can get a better idea of the candidates. Apparently people in the second phase are more or less equally qualified and the decision from their is more of a coin flip than anything.