“OVERTAKING AND UNBLOCKING”
The double necessity arises only on rare occasions. When the dummy contains no re-entry and the adversary opens a suit in which dummy has length, arrange the play of your own cards so as not to block the dummy’s suit.
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Should the first trick be won with the eight, the dealer cannot overtake the ten without loss. The ten should, therefore, be played and the lead continued with the queen. If the adversary covers, the trick must be passed. The eight should then be led through the jack.