POSSESSION is defined by the manual under G12 as follows:
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An ALLIANCE may not POSSESS their opponent’s BALLS. The following criteria define POSSESSION :
“carrying” (moving while supporting BALLS in or on the ROBOT),
“herding” (repeated pushing or bumping),
“launching” (impelling BALLS to a desired location or direction via a MECHANISM in motion relative to the ROBOT), or
“trapping” (overt isolation or holding one or more BALLS against a FIELD element or ROBOT in an attempt to shield them).
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Blue Box:
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Examples of BALL interaction that are not POSSESSION are
A. “bulldozing” (inadvertently coming in contact with BALLS that happen to be in the path of the ROBOT as it moves about the FIELD) and
B. “deflecting” (a single hit to or being hit by a BALL that bounces or rolls off the ROBOT).
A BALL that becomes unintentionally lodged on a ROBOT will be considered POSSESSED by the ROBOT. It is important to design your ROBOT so that it is impossible to inadvertently or intentionally POSSESS an opponent’s BALL.
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Additionally Q&A has made some statements with regards to blocking that should also apply to catching:
Q177:
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Generally, if [a] MECHANISM is in motion relative to the ROBOT at the time of impact, it is "launching" and thus POSSESSION. If the MECHANISM is not in motion relative to the ROBOT, it is considered "deflecting" and not POSSESSION.
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