Post by Howard WachtelMatchpoints, None Vul.
N/S bidding, E/W silent, N is dealer. Walsh in use.
1D 1H 1S
How many diamonds (at minimum) must North have for this sequence?
That depends on system and partnership agreement.
There are people playing a form of 5-card majors, better minor, who would say 3. They open 1D on, say, KQxx xxx AKx Jxx
Excluding those, and assuming that 1D only shows a 3-card suit if you are exactly 4432, then if you have 4 spades and not 4 hearts, you must have 4 diamonds.
The 'standardish' 5-card major world (so not thinking of Precision or Polish Club or Carrot Club or....) is split into three.
Some people rebid 1S with 4 spades here whether the hand is balanced or not, so they could be 4243, say. This is standard Norwegian bidding, for example. It also includes a chunk of US players.
Others always rebid NT when they have a balanced hand, and so a 1S rebid then shows an unbalanced hand. They either have 5 diamonds (nearly all the time) or are exactly 4144
A smaller group play a 1D opening as showing 5 cards (or perhaps 4441), and another small group open 1C with a 4144. These people will have at least 5 diamonds.
Post by Howard Wachtel1D 1H 2S
How many diamonds must North have for this sequence?
Assuming 2S is natural and game forcing, at least 5 diamonds.
Post by Howard Wachtel1D 1H 2NT
Same question
Assuming 2NT is natural and shows a strong balanced hand,
4, unless you open 1D on KQxx AKx AKx xxx in which case 3.
Post by Howard WachtelThank you.
Howard Wachtel