Though I now play the above system with one partner, including opener bidding the OTHER major over the re-ask, I would not have thought of it as expert standard. Maybe I'm behind the times. I've always played that redouble showed a strong desire to play in 2♣XX (5 clubs or 4 great ones), and that pass was a suggestion to play 2♣XX (4 good clubs). Now responder's XX is to play. Other bids by opener are as if no double, and now responder can bid 3♣ to check on a stopper. Until a year ago, I would have thought that was expert Standard. Perhaps what jjbrr describes is the new Expert Standard, but I certainly wouldn't assume any of it without an agreement. Maybe this way is better - it hasn't come up yet with the one partner I play it with - but I've had good results playing in 2♣XX, and bad results when they've done so against me, so I like the system that caters to getting there more often. People tend make rather unsound doubles of 2♣. You probably know much better than I do what one would consider "expert standard." I've been under the impression that partners and I have been on the same page in this auction, so I interpreted it as "standard," but maybe I've been mistaken. Your points about people making unsound doubles and 2♣xx being a long-term winner are both very accurate imo.