I would like to submit myself as a judge.
Failing that, I would like to submit the good Terminator from Terminator 2: Judgement Day. From the scene where it does battle with a horde of police except with the 'no killing' order revoked...
Notes:
Learning computer: Highly adaptable but takes a while to get there, starts with extensive knowledge of mechanical principals, military tactics, motor vehicles, weapons, human anatomy, and basic knowledge of human interaction.
Robot: Constructed from metal, possibly future-metal... No pain reflexes, no significant effects from shallow wounds, no bruising, capable of producing largely unlimited auditory effects, immune to interpretive optical illusions, perfect memory, does not need to eat, sleep, drink, or breath, presumably shielded against electromagnetic pulses, which are also lethal to humans if powerful enough...
Armed: Has access to a handgun, grenade launcher(with multiple tear gas canisters), and a minigun(with, maybe, 20 seconds of ammunition).
Living skin: appears human to most forms of detection, although carrying a minigun in one hand would probably be a clue...
Resources: I am hoping that I can make up some repair facilities and ammo supplies, as a robot, most injuries are repairable, although mental damage would not be and its relatively advanced technology would probably make any repairs less effective then the original state.
Weaknesses: Power supply in torso, mental circuitry in head, relatively exposed joints, programmed to obey orders from a specific person, some limited emotions.
available information:
General: extremely armed and extremely dangerous, has some form of bulletproof armour.
Secret: schematics of forearm and computer chip, recordings of an attack on a police station, can be destroyed using heavy machinery.
Future: detailed knowledge, but no access to its specific programming.