The reasoning is the following: since a 2♣ opening is a strong bid and 2♦ a weak one, it's more likely that you'll have a hand that wants to bid pass-1M-2♣ as natural. The range of hands that would want to bid pass-1M-2♦ as natural is narrower because with some of them, you'd have opened 2♦.
Example: with, say,
♠ KJx
♥ xx
♦ KQTxxx
♣ xx
you'd would simply open 2♦, whereas with
♠ KJx
♥ xx
♦ xx
♣ KQTxxx
you'd pass for lack of a weak 2♣ opening. If bidding goes
You Pard
Pass 1♥
??
you'd now have a perfect 2♣ bid, if it were natural.
So the proposal is to use 2♦ as Drury. Since it is done with a diamond bid, I nicked it "golden Drury".
Disadvantages? You lose the standard 2♦ rebid over Drury (pass-1M-2♣-2♦) to indicate a reasonable minimum, opener. But to be honest, I can't remember the last time that bid made a difference for me.. lol.
Anyway. just a small idea. I don't know if this is original or not, but if it is, remember you heard it first here
