  A Thurston map $f\colon (S^2, A) \to (S^2, A)$ with marking set $A$ induces a
pullback relation on isotopy classes of Jordan curves in $(S^2, A)$. If every
curve lands in a finite list of possible curve classes after iterating this
pullback relation, then the pair $(f,A)$ is said to have a finite global curve
attractor. It is conjectured by Pilgrim that all rational Thurston maps that
are not flexible Latt\`{e}s maps have a finite global curve attractor. We
present partial progress on this problem. Specifically, we prove that if $A$
has four points and the postcritical set (which is a subset of $A$) has two or
three points, then $(f,A)$ has a finite global curve attractor.
  We also discuss extensions of the main result to certain special cases where
$f$ has four postcritical points and $A=P_f$. Additionally, we speculate on how
some of these ideas might be used in the more general case.
