Agreed, except that I think that opener should bid 5
♠ or 5
♥ over 4
♠ if he or she wants to try for slam. I think it's best to never bid RKCB unless the response tells you 100% what to do. (For one thing, this gives you useful inferences when someone makes a slam try skipping 4N.) Responder will accept either. (It's not automatic over 5
♠, but I can't picture a hand for opener that has extras, not solid spades, and no heart control.)
On second thought, 5
♥ might be too unliateral; partner is likely to accept with
♠Kx
♥xx
♦Axx
♣KQxxxx which isn't so great.
rmnka447, on 2017-July-06, 13:12, said:
I also agree with Winstonm's comments.
2/1 does not have any agreed standard approach that everyone uses and agrees about. The ACBL convention card even shows this by having two boxes to check off -- Game Forcing or Game Forcing except when Suit Rebid.
As for a rebid of 2 ♠ showing 6, Max Hardy in his books asserted so but even he had to hedge in his examples. The problem set of hand are unbalanced minimums with 2nd suits unbiddable at the 2 level. After 1 ♠ - 2 ♦ you hold ♠ AKxxx ♥ Qxx ♦ x ♣ Kxxx and the only sensible rebid is 2 ♠. So for Hardy, 2 ♠ guarantees 6 except when it doesn't.
Even a 2 NT rebid has no common definition. I believe Hardy and Mike Lawrence had differences about that bid. One insisted it showed stoppers in unbid suit, the other didn't.
Then there's the question of what bids show extras and what bids don't. Some play 2 ♠ (and sometimes 2 NT) show minimums while any other bid shows "extras". Others just pattern out their hands without regard to strength.
So 2/1 is an approach built around the concept that a 2 level response is at least nominally game forcing with myriad variations based upon individual agreements. It's OK to specify how you'd take a bid but need to understand there are no absolutes.
In the versions I play with my fairly regular partners, 2 ♠ and sometimes 2 NT are catchall minimums, other bids normally show "extras". So our auctions would start out
1 ♠ - 2 ♣
2 ♠ - ?
Here the auctions would vary because some play 2 ♣ as an absolute game force while others play a ♣ rebid could be passed.
For the game forcers, the auction would be
1 ♠ - 2 ♣
2 ♠ - 3 ♣
3 ♠ - 4 ♠ ( 3 ♠ now shows 6)
?
and for the Suit Rebid can be passed bidders, the auction would be
1 ♠ - 2 ♣
2 ♠ - 3 ♦ (3 ♦ because responder has to force with something)
3 ♠ - 4 ♠
?
The question then is whether opener continues on beyond 4 ♠. In the 1st auction, it's more difficult to do so than in the 2nd. But with red suit controls and partner likely showing good ♣, 4 NT is not out of the question. After 5 ♥ (2 without the Q), does opener go on? Not sure, but more likely playing 5 ♠.