give me a suggestion

[patroclo]

Left opponent open a weak 2 or 3 in a suit where you are 4th or 5th.

Your partner double.

Right opponent pass.

You have another long suit aside and about 10 points.

what is better?

Leave the double or declare the other suit.

Sorry for my english.

Are there some rules ?

Gigi

[Quantumcat]

You would only leave the double in if you are quite sure the contract will not make, and you can't get a better score by declaring.

 

This means you need a very good holding in the opened suit, something like KJ984, and not a very weak hand (you need some side-suit tricks as well as trump tricks). If you don't have this, you must find another bid. Since you may be forced to bid a three-card suit here, having an actual long suit is excellent. With a good hand, bid game with it, or without a good hand, bid just 3.

[Fluffy]

As a general rule don't pass partner's take out doubles, even if you don't have a long suit it is often correct to bid a 3 card fragment and flee.

 

Very important thing is to understand that having xxxx or Jxxx on LHO's trumps is worht zero tricks, also ahving Axxx is worth only one trick, don't leave the double just because you have some lenght, you need also honnors to make tricks. Small cards are worth nothing if they don't have honnors to power up.

 

Now more specifically there will be times where leaving the double will be correct. But having lenght on opponent's suit is not enough, you also need quality. Note that AKxx is gonna make the same number of tricks as QJ109 and AK. With the difference that QJ109 is losing 2 tricks if you happen to declare while AK loses none. QJ109 in trumps is asking for defending, but AKxx is not.

 

What happens when you let opponents play doubled with long trumps is that there will be a lot of tricks sscored in the trump suit, and few on the side. This translates to something easy: If you have slow tricks (queens and jacks, KQ10 combos etc) in trumps you rather play in this trump suit, but if you have quick tricks (the ace) you rather play on another.

 

On the side suits the contrary is true. If you play in their trump suit you will only score the quick tricks, and they will ruff the slow ones. But if you play on your side suit you will score both the quick and slow ones.

 

So if your hand has slow tricks in their trump and quick tricks on the side, think about defending, but if you have quick tricks in their trump and slow tricks on the side, think of playing yourself better.