要するにタイマン勝負なんだけど、その試合内容は常人では考えられないほどの高レベル。

Essentially it's a one-to-one match, but the content of that match is a level so high as to be unthinkable to an ordinary person.

それは高レベルの集中力を必要とする種類の仕事だ。

It's the sort of work that calls for a high level of concentration.