Saturday, January 28, 2012

Simple and Jump Overcalls

1.1.       Simple Overcalls

These can be made quite light, often just for lead. Since most jump overcalls are strong, a simple overcall is often made on what would normally be a weak jump overcall (as little as 5 HCP). With an opening hand, an overcall is often made on a four-card suit (where hand is suitable for a 4-3 fit) with strength in opener’s suit where a takeout double is unsuitable. While jump suits are strong, not all hands with 15+ HCP qualify, so an overcall can have as much as 18 HCP. Any higher and you double.
Responses:
Overcall System
for most part following Ch. 17 Modern Methods from Overcalls by M. Lawrence
these methods deal with 1©/1ª overcalls,
so 1§-1©, 1¨-1©, 1§-1ª, 1¨-1ª, 1©-1ª
 
Double when only 2 suits shown = takeout, shows 2 unbid suits.
Double where responder bids 1N = takeout for 2 unbid suits
Double when 3 suits have been bid = shows unbid suit plus tolerance for overcaller’s suit (Snapdragon). Bid has this meaning only if overcaller can bid unbid suit at 1 or 2 level otherwise penalty.
Double after a 2ª pre-empt by responder = limit raise or better (using 2N as natural)
Redouble(after a negative double) = Rosencrantz, simple raise with A, K or Q of suit (this different)
New suits are non-forcing, searching for a better fit. So if you have a fit don't mess about make a raise.
New suits by a passed hand, guarantee a fit with overcaller, if they could have bid the suit at 1 level, but not if they would have had to bid that suit at the 2 level.
1N = 9-11 pts. with stoppers
Cue bid at 2 level (of lowest suit where 2 suits available) = limit raise with 3 card support, most likely balanced, also could be a trap. An unpassed hand could also have a stronger hand sometimes with a fit too.
Cue bid at 2 level of higher ranking suit after a 2/1 = 7-9 pts. raise, not limit raise as opps. have shown 23 pts. so to have limit raise must be shapely and would bid 2N.
2N = shapely mixed+ raise with 4+ trump, if no 2 level cue bid available or after a 2/1, may be 3 card support and invitational values
2N after a 2ª pre-empt by responder = 11 - 12 HCP with stoppers.
Cue bid at 3 level = mixed raise, a hand with the values to raise to the 2 level, which would probably compete to 3 level.
Cue bid of higher suit (will always be spades) at 2 level = natural
Cue bid of higher ranking suit at 3 level = good pre-emptive raise.
Jump cue-bid at 3 level = mixed raise, a hand with the values to raise to the 2 level, which would probably compete to 3 level.
Jump raise = lousy pre-emptive raise, where 2 cue bids available at 3 level. Otherwise a pre-emptive raise.
Jump shift = invitational when responder passes and pre-emptive when responder makes a NT or 2/1 response.
 
For a 1¨ overcall over 1♣, you would bid basically the same but now a cue bid would be looking for 3N.
For a 2♣, 2¨ or 2© overcall a cue bid is a limit+ raise and 2N is 9-11 HCP balanced.
 
Squeeze bids and Maximal doubles apply to overcalls where our partnership has raised a suit. See 6.2 Responses to 1D with interference for details.

1.1.       Jump Overcalls

The use we have for jump overcall is a little different than normal in North America. We use strong 1-suiter jump overcalls that are a good 15 to bad 19 HCP, if we are vulnerable at the 2 level or 3-level. The suit overcalled should be good. Bidding at the 3-level we use the normal weak jump overcall when not vulnerable. A double-jump is pre-emptive in nature. For a jump overcall in balance seat it still strong from an unpassed hand. However is from 6-10(11) HCP a 6 card suit at the 2-level and a 7+ card suit at the 3-level, if a passed hand or 3 level NV.
            Responding to a jump overcall:
            A simple raise: can be made on a singleton as overcaller is promising a good suit. This
            bid is limiting and non-forcing.
            A raise to game: again can be made on a singleton
            A new suit: F1. Offering a choice of suits.
            A cue-bid: GF. Slam try
For weak jump overcalls use the same methods as over a preemptive opening.

No comments:

Post a Comment