[EricH]

<G32> would probably be a better rule to go by.

And, the rule in question is <G32-C>.

If a portion of the BUMPER PERIMETER polygon is unprotected by BUMPERS, any contact by another ROBOT within the unprotected region (including the vertical projection of the unprotected region) will be considered incidental contact and will not be penalized.

In other words, if they hit you on the bumper perimeter, it won't be penalized. If they try to go inside, they are trying to make you violate <G32-F>, but <G18> blocks that. They may get a <G32-G>, depending on design. It is possible that <G32-D> is called into play, though highly unlikely. There is also <G33>, the entanglement rule, but I don't expect that to be an issue.

If you do go with this design, and there is adequate protection, I don't think it will be called on anyone in this specific case. Unless, of course, you try to take other robots in or they try to make you get a penalty.