BillPatch, on 2015-August-26, 14:21, said:
Perhaps in China you bid 4♦ with a Queen high suit and expect to be doubled and since you have no quick tricks, you expect to lose 13 tricks and all the IMPs.
In the West we fear losing telephone numbers and thus tend to bid 4♦ only with such a long suit with some top honors so that 4♦ doubled vulnerable will probably not be worse than the other side's potential game. We would expect partner to have 8+ diamonds to the AQ since we have the K.
Also, the AKQxxx is likely to take more than its two quick tricks if our side is declaring in diamonds or spades.
One normally uses Quick tricks only for an estimate of defensive tricks possible in the non-trump suits, or to determine whether to open a borderline hand with one of a suit or a weak NT.
In the West we fear losing telephone numbers and thus tend to bid 4♦ only with such a long suit with some top honors so that 4♦ doubled vulnerable will probably not be worse than the other side's potential game. We would expect partner to have 8+ diamonds to the AQ since we have the K.
Also, the AKQxxx is likely to take more than its two quick tricks if our side is declaring in diamonds or spades.
One normally uses Quick tricks only for an estimate of defensive tricks possible in the non-trump suits, or to determine whether to open a borderline hand with one of a suit or a weak NT.
Please refrain from making references like "in China you do this, but here in West we do that", or "wombats do that", etc. Typically people posting in the forums ask for readers opinion about the hand or the problem they are submitting, not about their country, species, skill level, or other inferences you keep inserting that come across as obnoxious if not plainly offensive.