However you are still permitted to have a different style than your partner and it is important that you know what your partner's style is for two reasons: firstly you must be able to describe your partner's bids accurately to the opponents, saying that partner has a weak two is not sufficient if, in practice, he only opens a weak two with 3-5 points; secondly, knowing what partner is likely to have can only help you bid!
In the Scotland vs Wales series of matches on BBO that Julian Pottage and I am running, three hands came up last night where style was the issue. So the questions are, what call would you make and what call do you think your regular partner would make?
We'll start with an easy one. First in hand at favourable vulnerability:
Three hearts, weak two hearts (or multi), pass or something else?
Next the other extreme, as you are second in hand at unfavourable vulnerability:
Some number of hearts, multi, two-suited two-level opener (Muiderberg (five hearts with 4+ minor), Polish (five hearts with 5+ other suit), restricted Muiderberg (five hearts with 5+ minor)), pass or something else?
Finally a higher level problem at love all:
In the match the one notrump opener was strong, but it makes little difference to the problem. What do you call: pass, double, five diamonds, something else? If you are thinking of passing or doubling it is highly likely that you will be leading very soon - what card is going to hit the table?
There are no right or wrong answers to these questions. But you and your partner should have an idea of what the other will do.