This is the robot that Sylvia and I built for the Innovation and Invention course at Lower Merion.
The main features are:
-5:3 drive gear ratio for better pushing, both for getting onto the platform and to push shooting bots away from the high goal
-Wedge, driven by two servomotors each on a 3:1 ratio, which lifts up and down to slide under opposing robot and help push the robot off the platform
-Arms for blocking the opponent's low goal and for herding balls into our low goal
Our basic strategy was to sit in front of the opponent's goal for the entire match, preventing all scoring until the last 30 seconds, when we would drive onto the platform for 15 points.