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Detail specifications 75D1 - Level 1

Defence in 2nd seat

The card to play by the defence
In 2nd position on play of a small card, most often you should, play "small" so as not to give a trick to the Opp on the right..
If dummy only has 2 cards, then this rule shouldn't be used blindly. If you have an honor 3rd (K/Q or J) it's in your interest to play it even on a high card in dummy
SWNE
1 SA Pass 3 SA Pass
Pass Pass
3 Diamonds
 9  
    
    
King Diamonds
6 Diamonds
5 Diamonds
Exercise 4538. In E in 2nd position, play your K on the 9 which is 2nd in dummy. The Declarer will only make 1 trick.
 
3 Diamonds
Queen Diamonds
8 Diamonds
4 Diamonds
2 Diamonds
 9  
    
    
King Diamonds
6 Diamonds
5 Diamonds
Ace Diamonds
Jack Diamonds
10 Diamonds
7 Diamonds
Exercise 4539. The proof - cards laid out.