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See <G32-C>. The area that is unprotected by bumpers and its vertical projection are incidental contact.
I honestly don't think we'll see too much of <G32-E> this year, due to the simple fact that there should be a good 6" of bumpers between robot superstructures in most cases and not being able to go beyond the bumper perimeter.
Eric, we have always assumed G32 C was in force, too. But I am concerned that the contact can be anything but incidental. We have a large opening and with a support bar (say 10 in about ground). An opponent robot can be struck hard and probably damaged by a high speed contact.
Even though G32E seems to say this is ok, G32C doesnt include exceptions so that is where I see a possible conflict. When you think about it, the configuration I'm describing voids the intent of the bumpers. There is an open space where bumpers would normally hit and a solid metal guard above the bumper zone at the edge of the robot waiting to do damage. So, I'm a little concerned.