我参加过各种比赛，到现在还打遍天下无敌手。

I've entered all sorts of contests, even untill now I'm still unbeatable.

如果你打遍天下无敌手的话，你就不会去试着拓宽自己的(业务)范围。

If you never fail, you (will) never try anything that stretches your boundaries.

虽然在接管北方联军时他跟林肯说“我会打遍天下无敌手”，但是看来他对能否成功还是心里敲边鼓。

Although when he took over the Union army he told Lincoln "I can do it all," he seems to have been unsure that he could do anything.

十年来打遍天下无敌手的国际象棋世界冠军卡斯帕罗夫在与人工智能棋手“更深的蓝”的系列对抗赛中失利。

For the undefeated International chess champion, Kasparov, he suffered a defeat to the artificial intelligence chess program "Deep Blue" in a series of competitions.