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There are rankings within each division and your ultimate goal is to be #1 in your division. When you play against and beat someone ranked higher than you, you take their rank.
For example, a Slammer sitting at B25 might challenge someone ranked as B5. If B25 wins, he or she becomes the new B5 and the other is bumped down to B6 in this case.
Eden Windish (auldphart)