Posted 2011-October-03, 16:19
I think that the strong players play a could-be-short 1♣ "clubs or balanced"; the weak players are playing majors 5, diamonds 4.
I think there are benefits to "clubs or balanced" (smartarse comment here: especially if they can convince the arbiters that it's natural, and don't have to play against conventional defences allowed against artificial calls), especially the 1♦ is unbalanced that Ken is talking about and Transfer Responses to 1♣. I'm not sure, however, that there are benefits to majors 5, diamonds 4 that aren't swallowed up in the "OMG, I can't raise because what if it's a 4-2 fit!"
But I've never played it. I know that SEF is a majors 5, diamonds 4 system, and there are some very good french players playing SEF, so there must be ways of making it work; but that addition to Standard American is almost always "weak player playing a panic system", so.
Having said that when I learned bridge (too many years ago), we played the "4-cards up the line, 5-cards down the line" that lowerline talked about. It basically was "yeah, 1♥ especially could be 4, but ignore that - you're playing 5-card majors".
When I go to sea, don't fear for me, Fear For The Storm -- Birdie and the Swansong (tSCoSI)