We can use 还 in sentences with 比 . It can be used to make sentences like: "He's better than any master".
In a sentence, 还 is placed between two identical nouns.
Scheme
A
比
B
还
B
Pay attention
In place of "A", we should state a subject.
In place of "B", we should state a noun that "A" is compared to.
Examples
他比小偷还小偷
He's better at stealing than any thief out there
tā bǐ xiǎotōu hái xiǎotōu
昨天你在说撒谎时演得比演员还演员
When you were lying yesterday, your acting was better any professional actor’s
zuótiān nǐ zài shuō sāhuǎng shí yǎn de bǐ yǎnyuán hái yǎnyuán