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“Not only does it not care about my resume or Brad’s, it can’t get discouraged if it gets one wrong,” he said. “It can’t get cocky if it gets one right. It always makes the best possible play at every single point. There was no consideration for ego or psyche.”

It was like playing against someone with the best conceivable reflexes, he said.

“I frankly thought it wouldn’t happen,” he said. “Once I saw Watson compete at a high level, I was very impressed. This is not just a little incremental step. This is a huge breakthrough.”