What is a dynamic short break rule and how does it work?

It's a little hard to explain so I would watch the help video. This rule is to help sell empty dates when the arrival dates is close, typically inside of 7 days. It's like that the dates haven't sold as your short break rules are set to stick to the popularity of the property. 

Setting dynamic short break rule will help you attached the last booking by offering more flexibility and showing your property in more search results.