Only rule I can find relevant to this is R35, which according to my interpretation, requires that a robot be able to be clearly identified from 100ft away. If a robot can still be identified from that distance, even with a blocked number (appendage) then the rule is met, IMO.
Quote:
[R35]
Teams shall display their team number on the Bumpers in four locations at approximately 90° intervals around the perimeter of the Robot. The numerals must be at least 4 in. high, at least ¾ in. in stroke width, and be either white in color or outlined in white. Team numbers must be clearly visible from a distance of not less than 100 ft, so that judges, referees, and announcers can easily identify competing Robots.
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Then if you look in the Q&A you'll find this:
Quote:
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A. Per [R35], team numbers must be clearly visible. This means that they may not be inverted, obscured, fragmented, upside down, etc. Bumpers that wrap around a corner are likely to be considered fragmented and not able to be seen in their entirety.
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According that the GDC's interpretation, if the numbers are obscured, you're not in compliance with R35?
Seems like there's the common sense interpretation of this rule and the literal interpretation of the rule. Maybe someone should ask in the Q&A?