A matchup, shortened to MU, refers to the estimated performance of a particular character versus another in competitive matches. This estimate can be expressed numerically in the form of a ratio, but since there is much contention in the community as to whether this type of measurement is misleading, another common way is to use a discrete scale (such as from -4 to +4) to denote the difficulty of a matchup. Character matchups are often organised into charts, and each Smash game has its own matchup chart, as follows:

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