[precpj]

Bidding went P P 1NT P 2C X RDL all pass ; partner first lead was Heart 9 dummy S T985 H AKT7 D AQJ C QJ , Ace of heart is played in the dummy, holding S A642 H 8643 D T832 C 4 which heart do I play? Standard carding in action

Question #2: the partner wins second trick with Club K and plays D 7, Jack is played from dummy which card of D do I follow ?

Precpj

[Gerben42]

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  Bidding went P P 1NT P 2C X RDL all pass ; partner first lead was Heart 9 dummy S T985 H AKT7 D AQJ C QJ , Ace of heart is played in the dummy, holding S A642 H 8643 D T832 C 4 which heart do I play? Standard carding in action

You should play the lowest ♥, discouraging.

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Question #2: the partner wins second trick with Club K and plays D 7, Jack is played from dummy which card of D do I follow ?

Since the Jack wins, it will be clear for partner that you don't have anything in ♦, so you will give ♦8, showing an even number.

[precpj]

At the table I was sitting the other side; ie i was the person holding C AKXXX and thought i was clever on xing their stayman. When the x by me backfied, of course I thought there was a chance the contract could be defeated

My thoughts: sitting behind the dummy

I would , acting on " when attitude is irrelevant ; count is virtually irrelevant, SUIT preference comes in play

1. A highest heart ; I think partner is trying to get a ruff

2. A highest D; again signalling a entry in spade again I can not cover over dummy's high D

Along the same line if my partersnhip happens to play bergen raise after 1H 3D ( my sublimit raise) and the oppo declares 4S to my LEFT. when partner opens up Heart Ace and dummy tables XX . I behind the dummy holding 9 7 5 2 , there are many ways to follow the suit while communicating the suit prefence

obviously the 5 is : use your judgement

can the obviously high carry some message and 1st low carries another ?

Prec