slambidding
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| - | Slam Bidding | + | **Slam Bidding** |
| Slam bidding, while glamorous, is overrated. While some double-dummy studies have shown that slams can occur as much as 16% of the time, many are not detectable/biddable. Practical small slams probably occur about 5% of the time, practical grand slams <1% of the time, and bidding system limitations prevent bidding them probably 50% of the time. Other studies have shown that of those slams bid, only about 50% are made. | Slam bidding, while glamorous, is overrated. While some double-dummy studies have shown that slams can occur as much as 16% of the time, many are not detectable/biddable. Practical small slams probably occur about 5% of the time, practical grand slams <1% of the time, and bidding system limitations prevent bidding them probably 50% of the time. Other studies have shown that of those slams bid, only about 50% are made. | ||
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| So our bidding system includes conventions for detecting and bidding slams. But only the obvious ones. The highly distributional or hidden slams are left to those who wish to devise methods to handle them. | So our bidding system includes conventions for detecting and bidding slams. But only the obvious ones. The highly distributional or hidden slams are left to those who wish to devise methods to handle them. | ||
| - | Slam Detection | + | **Slam Detection** |
| HCP=High Card Points, DP=Distribution Points | HCP=High Card Points, DP=Distribution Points | ||
| Based on the “Winning Tricks” evaluation method, a small slam requires: | Based on the “Winning Tricks” evaluation method, a small slam requires: | ||
| - | 33+ HCP in NT | + | * 33+ HCP in NT |
| - | 32 points (HCP+DP) with an 8 card fit in the trump suit | + | * 32 points (HCP+DP) with an 8 card fit in the trump suit |
| - | 29 points (HCP+DP) with a 9+ card fit in the trump suit | + | * 29 points (HCP+DP) with a 9+ card fit in the trump suit |
| So, if Opener bids 1NT (11-15), Responder must have 20+ HCP to be in range of a small slame. If Opener has13+ HCP then slam is probable. Responder can determine if Opener has 13+ HCP by using Australian Stayman, whose responses include and indication of which range of HCP the opener has. Alternatively, Responder can bid 4NT (“Quantitative Ask”) to which Opener passes if 11-13 HCP or bids 6NT with 13-15 HCP. | So, if Opener bids 1NT (11-15), Responder must have 20+ HCP to be in range of a small slame. If Opener has13+ HCP then slam is probable. Responder can determine if Opener has 13+ HCP by using Australian Stayman, whose responses include and indication of which range of HCP the opener has. Alternatively, Responder can bid 4NT (“Quantitative Ask”) to which Opener passes if 11-13 HCP or bids 6NT with 13-15 HCP. | ||
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| If Opener opens 1D (11-15), then Responder must have similar points to a 1M (11-15) open but must have additional length in D. Again, a bid of 2NT initiates the slam investigation (see below). | If Opener opens 1D (11-15), then Responder must have similar points to a 1M (11-15) open but must have additional length in D. Again, a bid of 2NT initiates the slam investigation (see below). | ||
| - | If Opener opens 2C (11-15 6+ C or 5C with a 4 card major) , similar point requirements apply. Responder can determine Opener’s range by bidding 2D, an asking bid for a possible major. The responses to the 2D bid include a range indication. see below | + | If Opener opens 2C (11-15) (6+C or 5C with a 4 card major) , similar point requirements apply. Responder can determine Opener’s range by bidding 2D, an asking bid for a possible major. The responses to the 2D bid include a range indication. see below |
| If Opener opens 2D (11-15 with 4414), similar point requirement apply, but we do not have a way of determining range. One difference is that because of Opener’s known distribution, Opener’s hand can be upgraded by Responder to account for Distribution Points. | If Opener opens 2D (11-15 with 4414), similar point requirement apply, but we do not have a way of determining range. One difference is that because of Opener’s known distribution, Opener’s hand can be upgraded by Responder to account for Distribution Points. | ||
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| If Opener opens 1C (16+), and Responder has 12+ HCP, slam investigation should commence after confirmation of trump suit or NT. see below | If Opener opens 1C (16+), and Responder has 12+ HCP, slam investigation should commence after confirmation of trump suit or NT. see below | ||
| - | If Opener opens 2NT (22-24) and Responder has 10+ HCP, Responder should give jump response to indicate slam potential. For example: 2NT-3C-3S-5S or 2NT-3H-3S-4NT | + | If Opener opens 2NT (22-24) and Responder has 10+ HCP, Responder should give jump response to indicate slam potential. For example: 2NT-3C-3S-5S or 2NT-3H-3S-4NT |
| The above cases account for probably 80%-90% of the biddable slams. The remainder we leave to those who can embrace the added complexity required to handle them. | The above cases account for probably 80%-90% of the biddable slams. The remainder we leave to those who can embrace the added complexity required to handle them. | ||
| - | Slam Investigation | + | **Slam Investigation** |
| Slam Investigation involves 2 tasks: Range determination and Controls determination. In the cases where Opener opened with one of the intermediate range bids (1D/1H/1S/1N/2C) Responder needs to determine whether Opener has 11-13(weak) HCP or 13(strong)-15 HCP. After determining the range of Opener’s HCP see below , Responder must then determine if partnership is missing essential controls see below. | Slam Investigation involves 2 tasks: Range determination and Controls determination. In the cases where Opener opened with one of the intermediate range bids (1D/1H/1S/1N/2C) Responder needs to determine whether Opener has 11-13(weak) HCP or 13(strong)-15 HCP. After determining the range of Opener’s HCP see below , Responder must then determine if partnership is missing essential controls see below. | ||
| The Responder asks for the range information after a suit open by directly bidding 2NT (this is Beta asking bid here) (assuming no interference). Opener’s rebids are: | The Responder asks for the range information after a suit open by directly bidding 2NT (this is Beta asking bid here) (assuming no interference). Opener’s rebids are: | ||
| - | 3NT : 11-13 HCP (min sign off) | + | * 3NT : 11-13 HCP (min sign off) |
| - | Game in suit : 11-13 HCP, extra length in suit (min response jump to game in suit) | + | * Game in suit : 11-13 HCP, extra length in suit (min response jump to game in suit) |
| - | Any other : 13-15 HCP, response to Controls asking bid (positive slam interest). | + | * Any other : 13-15 HCP, response to Controls asking bid (positive slam interest). |
| The Responder asks for range information after a 1NT open by by bidding 2C, Australian Stayman. Opener’s rebids are: | The Responder asks for range information after a 1NT open by by bidding 2C, Australian Stayman. Opener’s rebids are: | ||
| - | 2X,2N : 11-13 HCP | + | * 2X,2N : 11-13 HCP |
| - | 3X : 13-15 HCP | + | * 3X : 13-15 HCP |
| If interference occurs directly after the opening bid, then slam, while possible, is much more unlikely or difficult to bid. Consequently we abandon any slam investigation and focus on reaching a game contract. | If interference occurs directly after the opening bid, then slam, while possible, is much more unlikely or difficult to bid. Consequently we abandon any slam investigation and focus on reaching a game contract. | ||
| - | Control Asking Bids and Responses | + | **Control Asking Bids and Responses** |
| After a slam has been determined to be probable, the controlling hand (“the Captain”) should check to see if the partnership has all of the controls (Aces and Kings) necessary to prevent the opponents from taking immediate quick tricks to set the contract. This is accomplished by the use of Control Asking Bids. | After a slam has been determined to be probable, the controlling hand (“the Captain”) should check to see if the partnership has all of the controls (Aces and Kings) necessary to prevent the opponents from taking immediate quick tricks to set the contract. This is accomplished by the use of Control Asking Bids. | ||
| - | While the partnership can use whatever conventions they desire,this bidding system favors the use of 2 types of Control Asking Bids: Beta Asking bids and RKC1430. | + | While the partnership can use whatever conventions they desire,this bidding system favors the use of 2 types of Control Asking Bids: Beta Asking bids and RKC1430. |
| Control Asking bids occur when: | Control Asking bids occur when: | ||
| - | A bid of 2NT directly after an opening bid of 1D/1H/1S/2C is treated as a Control Asking Bid if Opener has 13-15 HCP. (Either Beta Ask or RKC1430 depending on partnership agreement) | + | * A bid of 2NT directly after an opening bid of 1D/1H/1S/2C is treated as a Control Asking Bid if Opener has 13-15 HCP. (Either Beta Ask or RKC1430 depending on partnership agreement) |
| - | A direct bid of 4C after a NT bid is a Control Asking Bid (Beta Ask). | + | * A direct bid of 4C after a NT bid is a Control Asking Bid (Beta Ask). |
| - | A direct jump to 4C (if C has not been bid as a natural suit) is a Control Asking Bid (Beta Ask). | + | * A direct jump to 4C (if C has not been bid as a natural suit) is a Control Asking Bid (Beta Ask). |
| - | A direct jump to 4D, if C has been bid as a natural suit, is a Control Asking Bid (Beta Ask). | + | * A direct jump to 4D, if C has been bid as a natural suit, is a Control Asking Bid (Beta Ask). |
| - | A direct jump to 4NT after a suit bid is a Control Asking Bid (RKC1430). | + | * A direct jump to 4NT after a suit bid is a Control Asking Bid (RKC1430). |
| - | A direct bid of 4NT after a confirmed trump suit is established is a Control Asking Bid (RKC1430). | + | * A direct bid of 4NT after a confirmed trump suit is established is a Control Asking Bid (RKC1430). |
| + | * | ||
| - | Beta Asking Bid Responses | + | **Beta Asking Bid Responses** |
| Beta Asking Bid responses are based on the number of Aces and Kings held by Responder, with an Ace representing 2 controls and a King representing 1 Control. For example, 2 Aces and 1 King would be 5 controls. | Beta Asking Bid responses are based on the number of Aces and Kings held by Responder, with an Ace representing 2 controls and a King representing 1 Control. For example, 2 Aces and 1 King would be 5 controls. | ||
| If the Beta Asking Bid was 2NT response to 1D/1H1/1S/2C, then Opener’s Beta Asking Response rebids are: | If the Beta Asking Bid was 2NT response to 1D/1H1/1S/2C, then Opener’s Beta Asking Response rebids are: | ||
| - | 3C : 0-2 controls | + | * 3C : 0-2 controls |
| - | 3D : 3 controls | + | * 3D : 3 controls |
| - | 3H : 4 controls | + | * 3H : 4 controls |
| - | 3S : 5 controls | + | * 3S : 5 controls |
| - | 4C : 6 controls | + | * 4C : 6 controls |
| - | 4D : 7 controls (the maximum possible under an 11-15 HCP open) | + | * 4D : 7 controls (the maximum possible under an 11-15 HCP open) |
| Notice that 3NT is skipped because of its use as an 11-13 range response. | Notice that 3NT is skipped because of its use as an 11-13 range response. | ||
| Asker may get further clarification of a 3C response by bidding 3D, in which case Opener rebids: | Asker may get further clarification of a 3C response by bidding 3D, in which case Opener rebids: | ||
| - | 3H : 0 controls | + | * 3H : 0 controls |
| - | 3S : 1 control | + | * 3S : 1 control |
| - | 3N : 2 controls | + | * 3N : 2 controls |
| If the Beta Asking Bid is a bid of 4C (or 4D) then Responder bids: | If the Beta Asking Bid is a bid of 4C (or 4D) then Responder bids: | ||
| - | 4D (or 4H) : 0-2 controls | + | * 4D (or 4H) : 0-2 controls |
| - | 4H (or 4S) : 3 controls | + | * 4H (or 4S) : 3 controls |
| - | 4S (or 4N) : 4 controls | + | * 4S (or 4N) : 4 controls |
| - | Next bid : 5 controls | + | * Next bid : 5 controls |
| - | Etc. | + | * Etc. |
| - | Asking for Singleton/Void | + | **Asking for Singleton/Void** |
| After receiving the Beta Asking Bid response(s), the Captain can ask the Responder if they have a singleton or void. This is done by bidding the next higher suit (other than the agreed upon trump suit). Responder answers by bidding the singleton/void suit at the cheapest level. | After receiving the Beta Asking Bid response(s), the Captain can ask the Responder if they have a singleton or void. This is done by bidding the next higher suit (other than the agreed upon trump suit). Responder answers by bidding the singleton/void suit at the cheapest level. | ||
| - | RKC1430 | + | **RKC1430** |
| If RKC1430 is chosen as the Control Asking Bid for 1M-2N sequence, then the responses are: | If RKC1430 is chosen as the Control Asking Bid for 1M-2N sequence, then the responses are: | ||
| - | 3C : 1 or 4 controls | + | * 3C : 1 or 4 controls |
| - | 3D : 0 or 3 controls | + | * 3D : 0 or 3 controls |
| - | 3H : 2 controls, no Q of trumps | + | * 3H : 2 controls, no Q of trumps |
| - | 3S : 2 controls, Q of trumps | + | * 3S : 2 controls, Q of trumps |
| If the Control Asking Bid is 4NT, then the responses are: | If the Control Asking Bid is 4NT, then the responses are: | ||
| - | 5C : 1 or 4 controls | + | * 5C : 1 or 4 controls |
| - | 5D : 0 or 3 controls | + | * 5D : 0 or 3 controls |
| - | 5H : 2 controls, no Q of trumps | + | * 5H : 2 controls, no Q of trumps |
| - | 5S : 2 controls, Q of trumps | + | * 5S : 2 controls, Q of trumps |
| Kings, not including the King of trumps, may be asked for by bidding 5NT. The responses are: | Kings, not including the King of trumps, may be asked for by bidding 5NT. The responses are: | ||
| - | 6C : all or none | + | * 6C : all or none |
| - | 6D : 1 | + | * 6D : 1 |
| - | 6H : 2 | + | * 6H : 2 |
| + | |||
| + | There are a number of other extensions to the RKC1430 convention that the partners may agree to use. | ||
slambidding.1531262746.txt.gz · Last modified: 2018/07/10 22:45 by ldrews
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