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Detail specifications 73KA - Level 1

When the opponent has a long suit

L'adversaire dangereux

You are the declarer of a NT contract and you have detected, thanks to the bidding or during play, that one of the opps has a long suit that could defeat the contract or could play 'across' a suit that is not well guarded . To make your contract, you must avoid letting that 'dangerous opponent' get in hand v.
The easiest and most common technique is to direct the finesses against him, ie, to take the risk on the 'non dangerous opponent' ....If it fails, it is the riskless opponent that gets in hand. No worries !
For example.
Yu are in South, as declarer of a 4 NT contract. West leads 10 : You have 7 direct tricks and the could supply the missing tricks... Who is the dangerous opponent ?
SWNE
2 SA Pass 4 SA Pass
Pass
Ace Spades
Jack Spades
4 Spades
Jack Hearts
10 Hearts
Queen Clubs
10 Clubs
9 Clubs
Queen Diamonds
Jack Diamonds
10 Diamonds
9 Diamonds
3 Diamonds
    
10   
    
Queen Spades
6 Spades
3 Spades
Ace Hearts
Queen Hearts
Ace Clubs
King Clubs
Jack Clubs
4 Clubs
Ace Diamonds
8 Diamonds
7 Diamonds
2 Diamonds
Problem 25542 East is your dangerous opponent for the , the only suit that presents a risk. You can't afford to let East in hand twice ...
 
 
East is the dangerous opponent for the
Which card will you play from dummy on the lead of the 10 ?

SWNE
2 SA Pass 4 SA Pass
Pass Pass Pass Pass
Ace Spades
Jack Spades
4 Spades
Jack Hearts
10 Hearts
Queen Clubs
10 Clubs
9 Clubs
Queen Diamonds
Jack Diamonds
10 Diamonds
9 Diamonds
3 Diamonds
    
10   
    
Queen Spades
6 Spades
3 Spades
Ace Hearts
Queen Hearts
Ace Clubs
King Clubs
Jack Clubs
4 Clubs
Ace Diamonds
8 Diamonds
7 Diamonds
2 Diamonds
Problem 25543 You must avoid east being in hand at all costs. Take the lead with the Ace and replay right away the Queen . If East raises with the King you take it with the Ace, , if not, you duck. West cannot do anything against your Ace Queen tenace in 8
East will get in hand on the return, but you'll play the Ace and make your contract.