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.
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.

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