That would be because of rule <G20> :
Quote:
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Originally Posted by <G20>
<G20> TRACKBALL Locations - After all ROBOTS participating in the MATCH are in their starting
positions and the TEAM members are in the ALLIANCE ZONE and/or ROBOCOACH
STATIONS, four TRACKBALLS will be placed on the OVERPASS. On each side of the
OVERPASS there are three TARGET LOCATIONS for TRACKBALLS. The field
management system will randomly choose an initial starting location for the TRACKBALLS
before the start of each MATCH. One red and one blue TRACKBALL will then be positioned
in the chosen TARGET LOCATIONS on each side of the OVERPASS. After this point in
time no ROBOT may be moved or repositioned until the MATCH starts.
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Emphasis mine.