Design one of the two self-contained vehicles collaborating to balance by arranging their position on a seesaw and keep the distance between them.

The two collaborating vehicles, initially placed rather arbitrarily on the seesaw, are expected to move so as to provide horizontal balance and keep a gap of about 50 cm between them.

To make balancing easier, the seesaw is supported on a cylindrical (rather than a sharp) wedge, 10-12 cm in diameter.

The vehicles must be capable of re-balancing under disturbances such as added or shifted weights, wind forces, alterations of the support point, etc.

The plank should be a flat board of size and material commonly decided upon(*), containing no sensors or marks.

Robots are not allowed to have parts extending below the plank.

Precautions must be taken not to fall off the plank and not to harm the other robot.

Robots must be able to operate under sensor interference originating from the other robots.

Possible extra features

Satisfactory performance even if the supporting cylinder is allowed to roll.

Satisfactory performance with support cylinders of smaller diameter.

(*) Common standards to be satisfied to make cooperation possible, such as the size and properties of the plank (seesaw) and support, limitations on the size and weight of the vehicles if any, etc. are to be decided upon by a joint standards committee, composed of representatives of teams undertaking the project.