This is also mentioned in the article but I think it is worth mentioning again: Those games were played a year ago. That’s a long, long time ago. IBM started bu

This is also mentioned in the article but I think it is worth mentioning again: Those games were played a year ago. That’s a long, long time ago. IBM started building Watson (obviously not completely from scratch but as a Jeopardy contestant) only four years ago. All those games Watson played during the last year were played with the express purpose of improving Watson.