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Detail specifications 72B1 - Level 0

Signalling on the lead trick in a NT contract

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Signaling by the 3rd player after his partner's lead.
Most of the time, he will have to play his highest card. If either his partner -who led, or dummy, is master, then he will be able to send his partner a signal.
The signals will depend on the lead card (low or high) and on dummy's cards.
  1 - On a low card lead odd-even card count
  2 - On an honor lead signaling will depend on the honor (Ace, K, Q) and dummy's cards
 5  
   A
    
10
2
9
8
4
Exercise 4974 Dummy is making the trick. Give your partner your card count. Play the 9, later you'll play 4 . Showing an even number of cards.