March 2010 Banded Quartets 1800+

There are four entrants for this tournament with grades below 1800. They cannot have been above 1800 at time of entry, looking at their profiles. How can this be?

Tournament Entry Rating is calculated by the formula (CurrentRating + HighestRating) / 2. The entry rating will never drop to more than 100 points below your Highest Rating.

The highest rating is taken as your highest rating in the last 365 days.