http://dronegames.co/ doesn't state what the judging criteria is. If it's "survive to the end" then why not heavily shield your drone, bolt it to a fixed stand, affix a heavy EMP generator, and fry all the other electronics in the room? Your drone won't be able to do anything useful as it's bolted down but its shielding will at least allow the electronics to blink some lights and technically you could win on that fact alone.

Presumably such a tactic would violate the spirit, which I take to be demonstrating cool and unique capabilities without having to deal with hostile threats. However, I haven't been following, so perhaps drone to drone interference is actively encouraged and expected.