Posted 2025-January-15, 19:05
This from Standard Modern Precision, p. 166:
"SMP Jacoby 2NT":
2NT shows a limit raise or better over partner's 1M opening bid. The hand may be unbalanced. Responses over 1♥:
3♣: Any hand that would accept any limit raise. Game Forcing
....3♦: Original Game Force, balanced, requests opener show shortness
....3♥: No shortness
....3♠/NT/4♣: Singleton in the high/middle/low side suit (control bid now or sign off)
....4♥: Original limit raise, slam is impossible.
3♦: Artificial counter-try, about 13 HCP balanced or 12 unbalanced.
....3♥: declining, with a "bad" limit raise
....3♠: The other major. Balanced slam try, asks for shortness.
........step 1 (here, 3NT): no shortness
........step 2/3/4: shortness in the high/middle/low side suit.
....3NT/4♣/4♦: unbalanced slam try, high/middle/low shortness
....4♥: knows enough, there is no slam
3♥: (Opener's major) double negative, 11-12 balanced or 10-11 unbalanced with only 4 cards in the major.
....3♠: (step 1) Balanced slam try. Control bidding may commence. Responder has a really good hand in view of the double negative.
....3NT/4♣/4♦: unbalanced slam try, short in the high/middle/low side suit. Control bidding now, or sign off.
....4♥: still wants to bid game.
3OM/3NT/4♣: Void in the high/middle/low side suit. Responder control bids, or signs off with no slam interest.
As a side benefit, a direct splinter is more specific:
1♥: 3♠/4♣/4♦: 4+ trumps, void in the bid suit, 10-12 HCP.
I don't have much experience with this yet, but I think I'm going to like it. :-)
Note: this is, of course, in the context of limited openers. I'm not sure, but I think it could be played pretty much as is in a more standard context.
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Our ultimate goal on defense is to know by trick two or three everyone's hand at the table. -- Mike777
I have come to realise it is futile to expect or hope a regular club game will be run in accordance with the laws. -- Jillybean