battle of wills
clash of wills
test of wills

Looked as if the suitcase was going to win the battle of wills at any second.

In that moment I had the strength for our last battle of wills.

And he had used them to great advantage in their battle of wills.

Yet it was a battle of wills which she lost.

He was convinced that he'd won the battle of wills.

All I needed that moment was a battle of wills.

Now comes Game 3, which should be another battle of wills.

I held her in place, but it was a near constant battle of wills.

And the nation States have to win this battle of wills.

In Game 5, the series turned into a battle of wills.