What they did with Dota 2 was really surprising, the AI did a technique where if it was ahead it would go behind the enemy tower to get 100% of the gold while the enemy would struggle with last hits under the tower and take creep damage. I'd never seen anyone do this before and pro's started copying this after. The way I remember them explaining it was that the AI has something it's trying to maximize for, and it plays millions of games trying slightly different variations which can lead this kind of creativity, pretty wild.
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