Neat, I never noticed the "unique face" phrasing in the manual. I don't really get the intent of phrasing the rule that way; it's a bit of an odd requirement.
From 3.1.4 of the manual:
Quote:
...
A TOWER is CAPTURED if, at the conclusion of the MATCH:
A. the TOWER is WEAKENED, and
B. the TOWER is surrounded such that each of the three (3) opponent ROBOTS has SCALED or CHALLENGED a unique face of the TOWER
A ROBOT has SCALED or CHALLENGED a unique face of the TOWER if it is the only ROBOT in contact with the attached RUNG and/or associated third of the BATTER below (i.e. a ROBOT may extend over the divider into the space of another face as long as it is not in contact with the RUNG or BATTER in front of that face).
...
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I bet a lawyer could have fun with this... If you read "BATTER in front of that face" to mean any portion of the batter past the plane of that external face of the tower, then none of the captures seen in competition would have been legal.