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preempt, South jumped to 4
. A vulnerable overcall of 3
would show a good hand so the jump indicated a very strong hand.
North didn't hold many high card points but he had good heart support
and controls in two of the outside suits. He also knew his
partner should be short in diamonds. Realizing what a good dummy
he had, he used Roman Keycard Blackwood to check for the keycards (four
aces + heart king) and then bid the slam.