Posted 2014-October-12, 17:27
In most cases we need pd to hold ♦A in order to have a chance to beat this contract. There is also a chance that declarer may hold stiff ♦ A. (suppose declarer holds QTxxx Axx A 9xxx) In either scenario we need to knock down the ♣ A if we can. Ducking the spade requires pd to hold JT doubleton spades (with 3 he could have raised) which is way too specific to rely on imo.
♥ shift seems to cater If pd has something like Jx AJTx Axx Txxx but if this is the case club shift still works if pd has ♣T.(declarer can score 6 dia +2 clubs) So I think ♥ shift is not needed.
Keep in mind that if declarer held ♣K and weak holding in ♥, he would probably pitch ♣ x from dummy and not a ♥
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