In contrast to Kaketsu and Icedol, Alpha Go has learned hundreds of thousands of moves that no one has ever seen, without referring to past game records, so there is no way for humans to match it. When IBM's Watson beat Jeopardy's champion, it was a big surprise! But in the end, new algorithms are being created, such as question answering methods and image recognition using deep learning, etc., so we need to be able to determine what is the best match for our task.