chalks, on 2011-December-04, 02:35, said:
I'm sitting south:
Does north's 2h bid show 5h? I thought it only promised 4.
It shows 5.
A good way to realize this is to ask yourself the question if you can imagine a hand with only four hearts which would bid 2
♥ here. I bet you can't. Any hand with four hearts would have either three spades (in which case a spade raise is obviously better) or a 4-card minor (which you would bid instead of hearts because in general you bid 4-cards up the line). So even if it was permissible to bid a 4-card suit at the 2-level in response to an overcall, this particular bid would still promise 5. A 2
♥ response to a 1
♠ opening shows 5 for the same reason.
Another way of realizing this is to ask yourself it would be a practical agreement to allow this 2
♥ bid on a 4-card suit. Surely it would not. With 3-card support for hearts, opener should raise because whenever advancer actually does have five hearts, raising with 3-card support is superior to any other bid. This means that if 2
♥ could be a 4-card suit, you would frequently end up in 3
♥ in a 4-3 fit. Now a 4-3 fit is not so bad at the 2-level and that is part of the reason why we often allow 4-card suits to be introduced at the 1-level. But not so often at the 2-level.
Actually I like teaching the rule to beginners that the first natural suit bid you make shows 5 (unless partner has shown length in that suit already). Yes, there are exceptions. The 1
♥ and 1
♠ responses to a 1
♦ opening is an exception in almost all systems and most systems have a handful of other exceptions. In standard american, you can also bid 4-card suits when you
- open 1
♣ or 1
♦
- respond at the 1-level
- respond 2
♣ to a major suit opening and 2
♦ to a 1
♠ opening
- make a freebid of 1
♥ or 1
♠ after RHO overcalls 1
♦.
If you learn it that way, you don't have to ask yourself whether a bid shows 5 or 4 because unless it is on the short list of exceptions (or you have shown another suit first) then you know the answer. It shows 5. For example:
(1
♣)-dbl-(pass)-1
♥
(pass)-1
♠*
2
♣-(pass)-2
♦-(pass)
2
♠*
2
♣-(pass)-2
♠*
How many spades do each of these * bids show? They are not on the short list of exceptions and they are indeed the first natural bid made by that player (a 2
♣ opening is not natural in standard american). So you know the answer. They all show five spades. You don't have to learn these situations specifically.
And your 1
♠ overcall shows five as well. Because that is not on the short list of exceptions, either.
The world would be such a happy place, if only everyone played Acol :) --- TramTicket