When his partner opened one diamond he made an immediate response of six hearts.

Some opened one diamond, hoping that the bidding would not come to an abrupt halt.

After West opened one diamond in the third position, what should North have done?

His opponents struggled up to three no-trump after East had opened one diamond, and the lead was the club ten.

East had to open one diamond because one club, in their system, would have shown any hand with at least 16 high-card points.

If East opened one diamond, as he did at many tables, some pairs failed to reach any slam.

With 4-4 in the minors, most authorities recommend opening one diamond.

South opened one diamond, and almost played in that contract.

He opened one diamond and later jumped to six clubs.

He had opened one diamond because he was playing a strong-club system.