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The phrase "was the mastermind" is grammatically correct and can be used in written English.
It is often used to describe someone who has planned and orchestrated a complex or clever scheme or event. Example: "John was the mastermind behind the successful marketing campaign that boosted our company's sales." This sentence implies that John was the one who came up with the idea and strategy for the campaign.
Exact(59)
Deng was the mastermind.
"Angelo was the mastermind".
The trainer was the mastermind behind this.
She was the mastermind, he said.
Intelligence experts suspect Hussain was the mastermind.
Who was the mastermind of this?" Cook said.
Who was the mastermind behind the murder of Anna Politkovskaya?
He believed that Teresa was the mastermind of this crime.
Adebolajo was the mastermind of the Woolwich murder.
"He was the mastermind, and everything pointed to the mastermind," she added.
Similar(1)
He is the mastermind.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com