[ahecht]

Here is an interesting scenerio. You place a tetra of your color on a goal, but keep your robot in contact with that tetra. The other alliance stacks their tetras on top of yours, and you lift up your tetra and dump theirs off. Is this descoring?

Well, according to the definition of STACKED, "A TETRA is not considered STACKED if it is touching a ROBOT of the same alliance." Therefore, your tetra isn't stacked. However, the definition also says "A TETRA is STACKED when it is placed on top of a GOAL or on top of another STACKED TETRA." Therefore, because your tetra isn't stacked, your opponant's tetras were never stacked, and therefore removing them is not descoring.

Likewise, if your teams tetra is below an opponant's tetra and your robot brushes past your tetra, you are making your tetra not stacked, which makes your opponant's tetra not stacked, which means you are descoring. Therefore, touching your tetra under an opponants tetra is descoring even if neither tetra ever moves.