My idea for a tether was at first to try to climb on the opponenents robot. But I have figured out that this would gain me no points. But since being on top doesn't count, imagine a tether that can slide under a part of the opponenets robot and partially lift it to negate the points. This may be illegal too, but I don't see a why you could climb on top of another bot, potential damaging it and not pick it up from underneath.