They went out on a limb in the bidding, but the opponents did not know it.

In this game, better if the opponent does not know what we are thinking.

The opponents knew they would have plenty of other opportunities to kill the bill.

He argues that the two opponents in a fight both know what they are getting into.

Had it been a dogfight, his opponent never would have known what hit him.

"My opponent doesn't even know the boundaries of this district," he said.

"I think if the opponents knew all of the facts that they would have embraced the idea," he said.

The opponents don't know how good a result they have.

He was now headed for a 900 penalty but his opponents could not know it.

"My opponents know they are beaten even before the first serve."