Blocking The Dummy
When the Declarer is playing a No-trump and the Dummy holds a long suit
without reentry, an adversary of the Declarer may have the opportunity,
when he has a card stopping that suit, of blocking it and preventing
the long cards from making, by holding the winning card until the
Declarer has played what is necessarily his last card of the suit.
Next: Avoid Opening New Suits
Previous: The Discard