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Official Q&A: VEX V5 Robotics Competition 2024-2025: High Stakes

Usage Guidelines All Questions

2315: SC3, definition of "inner edges" of rings


8889A
19-Nov-2024

The answer to Q&A 2250 removed the shake test as a method of evaluating whether a ring is scored. Consequently, this leaves 2 criteria in rule <SC3> for a ring to be counted as scored:

  • The Ring is “encircling” a Stake. In this context, “encircling” means that any part of the Stake is at least partially within the volume defined by the inner edges of the Ring...
  • The Stake does not exceed its total permitted number of Rings (see definition of Stake). In the event of too many Rings on a Stake, the “highest” Rings will be removed.

The second bullet point regarding cases where a stake exceeds its permitted number of rings is relatively clear. However, the first one requires rings to be "encircling" the stake, and the meaning of this relies on the concept of "the volume defined by the inner edges of the Ring". We can see two different ways in which this phrase can be interpreted:

  • The "inner edges" of the ring are taken to mean the very innermost circular boundary of the hole in the ring. This would mean that the "volume defined by the inner edges" would be the plane going across the hole in the ring at the point where the hole is the narrowest.
  • The "inner edges" of the ring are taken to refer to all parts of the ring which face "inwards" - that is, if we placed the ring flat on a piece of paper and placed another piece of paper on top of the ring such that the ring is completely covered, the "volume defined by the inner edges" would be all the space between the two sheets of paper.

Two (rather crudely drawn) diagrams are provided here to illustrate these interpretations. In both diagrams, the red regions represent a cross-section of the ring taken along a vertical plane going through the center of the ring, and the purple regions represent the extent of the "volume defined by the inner edges". Which is correct?

Since the word "volume" is used, we are inclined to believe that the second interpretation is the correct one. However, the definition of a Stake is

A vertical ½” (12.7 mm) Schedule 40 PVC pipe (gray, red, or blue) with a compliant barb at the top, used for Scoring Rings.

Thus, the barb is also part of the Stake. When combined with the second interpretation, rings that are barely supported such as in this image would count as scored, but we have seen cases like this ruled as not scored at several competitions thus far.

Answered by committee
21-Nov-2024

Prior to our ruling on Q&A 2250, which was released on November 7th, the game manual allowed Head Referees to apply a theoretical "shake test" to determine whether or not a potentially-Scored Ring would fall off of a Stake. This language was removed in that Q&A, and will be removed from the game manual in the December 3 game manual update. It is expected that decisions regarding Scored Rings will have changed with that ruling. The Ring image linked in your final paragraph could reasonably have been ruled either way prior to that Q&A ruling.

Your second interpretation of 'inner edges' matches our intent. The inner edges of the Ring are all parts of the Ring which face 'inwards'; that is, if you placed the Ring flat on a piece of paper and another piece of paper on top of the Ring such that the Ring was completely covered, the 'volume defined by the inner edges' would be all of the space between the two sheets of paper.

Under criteria in rule <SC3> for determining whether or not a Ring is Scored, the Ring in your attachment should always be considered Scored.