circular reference results from a simple problem

Hi
We are old golfers trying to figure out another way to loose money among ourselves. We want to run a year long competition that records our lowest score on each hole during the year. In the attachment B4 is the weekly entry. B5 is the net score for that week and we want it compared to B8 which is the low recorded to date . If B5 is lower the it replaces the entry in B8 and if it is higher then B8 remains as is.

Any help will greatly assist the saving of our already thinning hair