Character matchup (SSBB)
A character matchup, or a counter, is a prediction on how two characters would fare against each other in tournament settings. For example, the matchup between Meta Knight and Samus favors Meta Knight, while the matchup between Olimar and Ness is (mostly) even. This list does not mean that a character has no chance of beating another character in any match, or that players cannot beat a certain character while using any certain character. In addition, this chart does not directly affect tier rankings, nor is it influenced by a character's tier ranking. It simply shows what the general outcome would be if two players with the exact same skill level played each other and used specific characters.
Below is the BBR's official chart for Super Smash Bros. Brawl version 3.0. The chart is current as of July 9th, 2013 in with a wholesale new version stated to be "extremely unlikely", though there is intent for a new process to update specific matchups instead of the entire chart. To use it, choose a character from the left side. That character's matchups are displayed in the corresponding row.