阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式，并将答案填写在答题卡上。

A world champion has retired because he has decided humans cannot beat   【小题1】     (computer) at his game.

The grand champion is Lee Se-Dol from South Korea, 【小题2】   was a world champion at the ancient, strategy board game Go. Some people compare Go to chess. Mr. Lee is【小题3】only person in the world to ever beat Google’s AlphaCo which is a special AI computer program【小题4】 (create) by Google to play Go. Mr. Lee, an 18-time world champion, said, “With the first appearance of Al in Go games, I’ve realized that I’m not at the top even if I become the number one.”

The game Go came in China around 3,000 years ago. Today, it is played【小题5】(main) in China, Japan and South Korea. It is believed to be the   【小题6】 (old) board game in the world. Mr. Lee started playing 【小题7】 the age of five. He 【小题8】 (turn) professional seven years later, when he was 12. He played five games against Google’s AlphaCo and lost four of them. He said his one victory was because of a “bug” in the program. The bug did not know what 【小题9】(do) when Mr. Lee made a “tricky” move. Today’s Go programs are much more 【小题10】 (power) than the one that beat Mr. Lee.