Instructions
Launch the game, sign in to your account and click "Multiplayer" to activate the multiplayer interface. Ranks increase and decrease from multiplayer games only. Single-player games have no effect on your ranking.
Choose "1v1," select your race and click "Find Game." Once the match-making system finds an appropriately ranked opponent, the game will begin.
Click "Menu" once the game starts or press "F10." Click "Surrender." The game will end, with your opponent as the victor. The score screen will appear. The number of ranking points you lose will appear in the right corner of the screen. Surrender 20 to 30 matches and you will likely see a drop in your ranking. If you're barely ranked for a league, surrendering two or three times may be enough to drop you to the next league down.