The ornamental design for a competitionring, as shown and described.
FIG. 1 is a top view of the competition ring. The bottom of the competition ring is flat and devoid of surface ornamentation.
FIG. 2 is a perspective view of the competition ring; and,
FIG. 3 is a side view of the competition ring. Each side is identical.
The broken line showing of an octagon shaped platform in FIGS. 1–3 is included for the purpose of showing environmental structure of the competition ring and forms no part of the claimed design.