Board Thread:Questions and Answers/@comment-28872594-20160628182239/@comment-74.203.131.11-20160628203733

Dariop94 wrote: I think it refers to the competition among the several houses in the series but I'm not sure about that.

It can have many interpretations. But yes, I believe the  correct interpretation is, "the strategic competition between the different groups to become ruler of the seven kindgoms."