In this replay, if you look at the map, west seems to be clearly winning - it has complete control over the south and is invading both the north and the south. However, if you use a widget to count the amount of metal (including the metal stored in units and structures) that each ally team has, east has significantly more. So who wins? West, with their huge territorial advantage? East, with their moderate metal advantage? As it turns out, east wins easily.
The biggest player on east (Senna) had a huge amount of eco in a fairly small base. Using all the metal and energy he had, he defeated west's northern army with T2 gunships and stopped their south invasion with krows. He then built a buzzsaw and destroyed most of west's eco, winning the game for his team almost single-handedly. Keep this in mind the next time rzbx tells you to push with T1 (or even T2) instead of teching

. Teching can be effective even when it leads to huge territorial losses!