Actually, I believe the rule
is
Quote:
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just for devices intended to let you hold your ground
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Hence, if you read the entire sentence instead of just reading part of it to get full understanding of the rule:
Quote:
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Anchors, i.e. devices that are deployed/used to keep one’s robot in one place and prevent if from being moved by another robot, cannot use metal in contact with the carpet or other playing surfaces to 'stay put.
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A metal caster which does exactly opposite of this would not be illegal. If I Made The Call anyway...