That is, frankly, silly advice. Even if you are one of the 1D on 4=5 school, which most North Americans are not, I very much doubt that you play a canape system, so that I am willing to bet you open 1♦ and rebid 2♣ on 5=4, many if not most 6=4, all 6=5 hands and so on. IOW, when you rebid 2♣ you are more likely to have diamonds longer than clubs than the other way around. tell it to Sidney Lazard the next time you see him When you are as good as Sidney Lazard, you can give your partners bad advice and still be respected. When you aren't, you can't. where do you think I got it? And considering it bad advice is just your opinion :)