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Bridge Axioms and Laws

This convention may, moreover, be used to great advantage by the original leader. How frequently he finds his suit hopelessly against him. Perhaps he holds no re-entry and the dealer in winning the first trick false cards. It is then that the original leader can use this echo to effect, to suggest that his suit should not be returned.
"The Change the Suit Call" may also be employed to some advantage on the dealer's trump or plain suit lead, to show great strength in one of the remaining suits, or by the original leader to indicate that the suit first led is not to be returned; but its main importance is in the no-trump application.

"The Change the Suit Call" is an absolutely sound trick-gaining proposition, and the successful results obtained from its use must rapidly establish it as a recognised convention of the game.
1
In some clubs, doubling ceases whenever the value of the odd trick exceeds one hundred points; in other clubs the limit is placed at two hundred points.