Magic Contest: Overview Scoring: Rounding 
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Rounding of scores is a popular topic with many opinions. Magic Contest gives you two options:
View scores with exact scoring
The scoring, however, is always exact no matter how many decimals you choose to show. This means that with 1 decimal shown there is a difference between total scores of 100.01 and 99.99 even though both are displayed as 100.0. 
Example
With exact scoring it looks like this:
With exact scoring and rounding to one decimal it looks like this:
These scores are only for display. The scores used for overall scoring are according to the first table. With WBF scoring it looks like this:
The exact scores are used for the overall scoring. Note that the sum of NS and EW can be larger than the top when WBF rules are used. 