It's been slightly over an year since the first tournaments have been posted on Pingic web site and because organizers are able to link tournaments into a series, the tournaments posted now can be linked to a tournaments posted an year ago.
Therefore arrows are added on the left and right from the tournament title, making it easier to browse through the tournaments in the same series and see results, reports and pictures from the past tournaments thus getting better insight into tournament.
If the arrows are not displayed it's because there are no other tournaments in the series.
Therefore it's important to use existing series name and not create the new one if the tournament pages were created already in the past.