Here is a good example of how my spawn control helped me we a game between otherwise very closely matched bots.
You should take note that each bot starts with three hills on this map. Each bot has two hills relatively close to each other and a third hill farther away and relatively close to two hills belonging to one of the other bots. My bot wins because it is the only bot to keep all three of its hills. The other three bots all lose their isolated hill. My bot is able to hold onto its isolated hill because it directs a higher percentage of its ants to that hill in order to match the higher number of ants coming from the more numerous enemy hills in the vicinity. Meanwhile the other two hills don't need as many ants because they can support each other and are not as threatened by the smaller number of enemy ants in the area.
Although this strategy doesn't always work, it paid off in this tightly contested match.
http://aichallenge.org/visualizer.php?g ... 20&user=10