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THE ONE NOTRUMP OPENING The amBIGuous Diamond uses a weak notrump opening. The recommended range is 12-14 HCP not vulnerable, 13-15 HCP vulnerable, although a partnership may want to play all such openings as one range or the other. When using a 12-14 range, however, do not alter the 16 HCP requirement for showing a strong notrump hand. Instead, open most 15 HCP hands with one of a suit. The extra strength will usually overcome any rebid problems, such as the following hands present: 1) S-A108 H-KQ3 D-J974 C-AJ9 2) S-KQ84 H-32 D-AQ93 C-A84 3) S-A8 H-762 D-KJ87 C-AQJ3 4) S-K3 H-AQ8 D-J8742 C-AJ8 With hand 1) stretch a little and open 1D, with those good spot cards and no attractive alternative. With hand 2) a 1S opening is okay because the 15 HCP permit a rebid of 2NT if the response is 2H, or a raise if the response is 2C or 2D. With hand 3) open 1C. With hand 4), choose between the slight overbid of 1D (intending to show a 16-18 HCP notrump hand) or the slight underbid of 1NT. A 2D opening is out of the question with weak diamonds and a balanced hand. Avoid opening one notrump with a hand that is suit-oriented. The weak notrump ideally shows a hand with 4-3-3-3 distribution and honors in all suits. Naturally this is not always possible, but a suit opening is preferable when the hand is far removed from this ideal. With marginal strength and a weak doubleton, just pass. 1) S-AQ83 H-AQ98 D-65 C-Q32 2) S-Q765 H-Q432 D-32 C-AKQ 3) S-AK54 H-Q87 D-A432 C-65 4) S-AK54 H-65 D-A432 C-J107 5) S-65 H-Q873 D-KQ32 C-KQ3 Open hand 1) with 1S, 2) with 1C, 3) with 1S, 4) with 1NT, and pass hand 5). Hand 3) presents no rebid problem, since a 2H response can be raised (this does not show extra values, and a 2H response to 1S implies five hearts). Hand 4) must be opened (reluctantly) with 1NT because a 2H response to a 1S opening would cause a rebid problem (The hand is not strong enough to rebid 2NT). In third or fourth seat you can open 1S and pass a 2H response. One type of suit-oriented hand that may be opened with 1NT is a 5-3-3-2 hand with a weak five-card major: S-J3 H-J8732 D-AQ2 C-AQ3. This hand is rather light for raising a minor suit response, and the hearts are too weak for a 2H rebid. As a least of evils, open 1NT, but open 1H in third or fourth seat, planning to pass a minor suit response. With a really marginal hand of this sort, just pass in first or second seat. The principle of avoiding notrump with suit-oriented hands also applies to stronger hands. Open 1C, not 1D, with S-AKQ3 H-65 D-J103 C-AQ103. Avoid bidding notrump with a weak doubleton, especially in a major, or with two unstopped suits. Responses In the absence of competition, respond to a weak notrump opening the same as to a strong 1NT bid (following a 1D opening), modified only to allow for opener's reduced point range. The following system of handling interference by the opposition is optional, not an integral part of the amBIGuous DIAMOND system. When 1NT Gets Doubled Directly for Business If you want to play the doubled contract, pass. Opener must redouble or bid a five-card suit. If he redoubles, you pass again. Otherwise, the following system of bidding over a business double can be used with both bad hands and hands that are good but unsuitable for notrump play: -- A redouble shows clubs, diamonds, and hearts; or diamonds and hearts, or hearts only. -- A bid of 2C shows diamonds, hearts, and spades; or hearts and spades; or spades only. -- A bid of 2D shows hearts, spades, and clubs; or spades and clubs; or clubs only. -- A bid of 2H shows spades, clubs, and diamonds; or both minors; or diamonds only. Note that the above calls can be made with both good and bad hands, since they are all forcing. -- A bid of 2S shows spades and diamonds, typically 4-5. -- A bid of 2NT shows a good hand with the rounded suits (HC) or the pointed suits (SD) Scrambling with a weak hand containing one or two four-card suits, or a hand too weak for one of the above actions, starts with a pass. If LHO doesn't save the situation by bidding, responder bids his lowest ranking suit when opener's redouble comes around. Opener passes with three or more cards in the suit, otherwise bids his cheapest suit. Ending up in a 4-3 fit instead of a 4-4 fit is quite possible. To avoid that mishap with 4-4 in the red suits or in the majors, it may be better to redouble (red suits) or bid 2C (majors) than to pass. Showing most other 4-4 hands with an immediate bid can get you to the three level with no fit, a probable disaster. A 4-3-4-2 hand can also bid 2C. Opener will prefer spades with 4-4 in the majors, so don't bid 2C with 3-4-4-2. Pass and bid 2D after opener redoubles. All the three-suited takeouts must have at least four cards in the "anchor" (i.e., highest possible rank shown) suit. The scramble bid may be to a five-card minor, probably with a 5-3-3-2 hand. Admittedly this can lead to trouble if opener doesn't pass. Another occasion for a five-card suit scramble is a weak heart-club hand with four hearts and five clubs (with five hearts, responder could redouble, planning to bid 2H ("hearts only") if opener bids 2D. An immediate jump to three of a suit is preemptive. With a good hand, pass and bid strongly on the next round: South West North East 1NT Dbl Pass Pass Rdbl Pass 3/suit - invitational 2NT - game forcing No doubt North has great distribution rather than high cards, with everyone else showing strength. When Fourth Seat Doubles for Business South West North East 1NT Pass Pass Dbl South must pass the double. If West also passes, North can run out to any suit as a natural bid. A redouble asks for a rescue, and South bids his lowest four-card suit other than spades, which means bidding 2C with 4-3-3-3 distribution. Each partner keeps bidding until at least a 4-3 fit is found, but North must run from a double of 2C with only three clubs, since South could have that 4-3-3-3 hand. When 1NT Gets Doubled Conventionally -- If the double shows a one-suited hand, suit unspecified ("Brozel"), all responsive bids have the same meaning as if the doubled had not occurred. A redouble shows useful defensive values, 8-9 HCP or more. The redouble says, "I think the hand belongs to us." The redouble may enable opener to double for penalties. Depending on vulnerability, responder may choose to redouble rather than bid with a strong (10 HCP or more) hand. Usually, however, the redoubler will not have a suitable two-level bid. A drawback of the redouble with a strong hand is that responder may not have a good call on the next round (e.g., no Stayman or Jacoby available). Since the double forces a 2C bid by fourth hand, another option is to just pass over the double with a good hand, then make a strong move (business double, 2NT, or jump) on the next round. A minimum suit bid after passing, even when not reopening, is weak: South West North East 1NT Dbl Pass 2C Pass Pass 2D - weak, just reopening South West North East 1NT Dbl Pass 2C Pass 2D 2H/2S - just competing North's major is probably a four-carder. She would have transferred on the first round with five. -- If the double shows two specific suits (e.g., both majors), the countermeasure known as "Unusual over Unusual" may be used: A bid in the higher of the opposing suits shows a good hand featuring the higher "unbid" suit, usually a six-bagger, while a bid in the lower of the opposing suits shows the lower "unbid" suit. A simple new suit bid is therefore not invitational. A redouble shows "cards," at least 8 HCP: South West North 1NT Dbl* 2S - diamond suit, invitational 2H - club suit, invitational 2NT - mildly invitational 3C/3D - not invitational Rdbl - 8 HCP or more * majors If South lacks support for the suit indicated "invitationally," he signs off by bidding North's suit. With a fit he bids 2NT (expres- sing doubt, probably with an unstopped major) or 3NT. -- If the double shows two non-specific suits (e.g., "both majors or both minors"), counter with the same tactics as against Brozel, described above. When There is an Artificial Overcall -- If the overcall shows two specific suits other than the one bid, use the countermeasure "Unusual over Unusual," described above. -- If the overcall shows the suit bid plus another specified suit, a cue bid in the bid suit is very strong, while a cue bid in the other suit is Stayman: South West North 1NT 2C* 3C - strong cue bid 2D - not inviational 2H - Stayman 2S - not invitational 2NT - mildly invitational 3D/3S - invitational * clubs/hearts The jump takeouts are forcing at IMP scoring. -- If an overcall of 2C shows a one-suited hand with an unspecified suit ("Hamilton"), a double replaces Stayman and all bids have the same meaning as if the overcall had not occurred. Since 2C is forcing, you can pass with a good hand if hopeful of doubling for business on the next round: South West North East 1NT 2C Pass 2D - forced bid Pass Pass Dbl - business 2H/2S - four-card suit West's pass of 2D indicates that his suit is diamonds. If North has a good hand he must either double 2D for business or make a strong bid like 2NT or a jump. A minimum reopening bid in a suit is not invitational. It tends to show a four-card suit because a five-carder would have been bid immediately. It also implies support for the next higher suit if opener is short in responder's suit. South West North East 1NT 2C Pass 2D - forced bid Pass 2H Dbl - business 2S - four-card suit North has S-KJ32 H-76 D-1032 C-AJ54. South can bid 3C with a doubleton spade and a club suit. When There is a Natural Overcall When an overcall at the two-level shows the suit bid, but does not show a specific second suit (i.e., it shows only that suit or that suit plus an unspecified suit) Rumpelsohl (described below) may be used. Negative doubles (also described later) should be used with Rumpelsohl. Since you are unable to make a natural raise to 2NT with Rumpelsohl, you need another way of possibly getting into the action with an invitational hand lacking a long suit. If you want to use business doubles of natural overcalls, perhaps only against vulnerable opponents, or maybe only when vulnerability is favorable, then don't use Rumpelsohl. In the absence of Rumpelsohl and negative doubles, doubles are for business and 2NT is a natural raise. -- When responder raises to 2NT over a two-level overcall, opener should show a major on his way to 3NT. A new minor suit rebid shows a maximum hand, five-card suit, and no stopper in the opposing suit. -- Simple free bids are not forcing, and are not even invita- tional at matchpoint scoring. With an invitational hand responder must generally bid 2NT at matchpoints, even with a suit-oriented hand. If space permits a jump, however, the invitational can be made that way (but major suit jumps are forcing at IMP scoring): South West North 1NT 2C 3D/3H/3S When the overcall is at the three level, a 3H or 3S response is invitational at IMP scoring but not at matchpoints. A 4C response is always Gerber. Over 3C, a 3D response is used for Stayman (but is natural, not invitational, if a negative double is used for Stayman: South West North 1NT 3C 3D - Stayman or natural 3H/3S - not forcing 4C - Gerber 4D/4H - Texas transfers -- Jacoby transfer bids do not apply, but Texas transfers apply after an overcall of 3C or lower (i.e., when both 4D and 4H would be a jump): South West North 1NT 2C 2D/2H/2S - natural, not inviting 4D/4H - Texas transfer 4C - Gerber South West North 1NT 3D 4D - Stayman, ostensibly 4H/4S - natural South West North 1NT 2D 4D - Texas transfer -- The cue bid replaces Stayman, and is forcing to game: South West North 1NT 2C 3C - asks for a major 1NT 2D 3D - asks for a major 3C - natural 1NT 2H 3H - asks for spades 1NT 2S 3S - asks for hearts In the first auction opener bids 3D with neither major, 3NT with both and a minimum, 4C with both and a maximum. In the second auction opener bids 3NT with neither major, 4D with both. (Remember that 3C is a natural bid unless the overcall was in clubs.) The cue bid may not be meant as Stayman when responder has a big hand with first round control of the opposing suit. If that is so, he will make it clear later in the bidding: South West North East 1NT 2C 3C Pass 3H Pass 4S - slam try, club ace or void Obviously North was not bidding 3C to find a major suit fit. -- A reopening double is takeout by opener, business by responder: South West North East 1NT 2H Pass Pass Dbl - takeout South West North East 1NT Pass Pass 2C Pass Pass Dbl - business All other doubles by either partner are for business. -- Simple free bids are not forcing, and are not even invitational at match point scoring. With an invitational hand responder must generally bid 2NT at match points, even with a suit-oriented hand. If space permits a jump, however, the invitation can be made that way (but major suit jumps are forcing at IMP scoring): South West North 1NT 2C 3D/3H/3S - invitational When the overcall is at the three level, a 3H or 3S response is invitational at IMP scoring but not at match points. A 4C response is always Gerber. Over 3C, a 3D response is used for Stayman (but is natural, weak, if a double is negative). South West North 1NT 3C 3D - Stayman or natural 3H/3S - not forcing 4C - Gerber 4D/4H - Texas Transfer If the overcall is 3D or higher, Texas does not apply, and a cue bid must be used for Stayman unless negative doubles apply. When responder raises to 2NT over an overcall, opener should show a major on his way to 3NT. A new minor suit rebid shows a maximum hand, five-card suit, and no stopper in the opposing suit. An optional strategy against two-level overcalls is Rumpelsohl: Rumpelsohl Rumpelsohl is a variation of Lebensohl, which uses a 2NT response to 1NT in competition as an artificial bid asking opener to bid 3C, after which responder can pass or bid. Incorporating transfers also enables responder to act with three types of hand containing a long suit: weak, invitational, or forcing. Responder can also show two suits via Rumpelsohl. The author of Rumpelsohl is Paul van Rijckevorsel of the Netherlands (Bridge World, October 1992). The version given here is an extension of the original version. Rumpelsohl may be applied selectively, as against non-vulnerable opponents only, or only with unfavorable vulnerability. When using Rumpelsohl, you should also use negative doubles (described below). Since you are unable to make a natural raise to 2NT, you need another way of possibly getting into the action with an invita- tional hand that lacks a long suit. Negative doubles may permit a bad overcall to go unpunished, which is why vulnerability may be a factor. Rumpelsohl applies only over natural overcalls that show the suit bid (even if the overcall shows in addition another, unspecified, suit--perhaps identified as a major, or minor, or pointed suit, or rounded suit, but not specifically identified). Use other measures (e.g., "unusual-over-unusual") against overcalls that show two specific suits. Here's how Rumpelsohl works: A free 2NT response shows either a hand with invitational strength or a club bust. Partner must bid 3C, after which responder can pass or make his invitational bid (no transfers here): South West North East 1NT 2S 2NT Pass 3C Pass Pass - club bust 3D/3H/3S/4C - invitational 3NT - clubs, invitational The Rumpelsohl bidder bids 4C to invite a club game with a hand that is unsuitable for notrump, 3NT with one that is suitable. To bid 3NT he either has spades stopped or a fairly solid suit (not both, which would be too much strength for a Rumpelsohl bidder). Opener passes 3NT with a spade stopper or a good club fit, otherwise bids 4C (possibly 5C). A free two-level suit bid is natural and non-invitational: South West North 1NT 2C 2D/2H/2S - natural, sign-off A free suit bid at the three level is a transfer bid with a very weak hand or a game-going hand, never an invitational hand. A cue bid (with one exception) is Stayman: South West North 1NT 2C 3C - Stayman 3D - transfer to hearts 3H - transfer to spades 3S - transfer to diamonds 4C - Gerber 4D/4H - Texas transfer 4S - mild notrump slam try 4NT - strong notrump slam try When a suit could have been shown naturally at the two level, a three-level transfer to that suit is obviously based on a strong hand. Responder could be weak, however, wanting to preempt the bidding with an extra long suit. Opener is permitted to jump in the indicated suit with four trumps and a good hand. The 3S transfer to diamonds, probably forcing partner to the four level, has to be based on a strong hand (a weak hand would have just bid 2D, but it implies either no club stopper or a weakish suit (else why not just respond 3NT?). If opener bids 3NT over 3S in this auction, he must have clubs stopped or a good fit in diamonds. Otherwise he must bid 4D. South West North 1NT 2S 3H - transfer to clubs Here opener can bid 3S if in doubt whether to bid 3NT or 4C. Responder can take this as asking for a partial stopper or better in spades, without which he must not bid 3NT. A transfer to a major followed by a 3NT bid is the standard way of describing a balanced hand with a five-card major. This sequence says nothing about the opposing suit. With no stopper and only a doubleton in support of the major, opener will have to use his judgment in deciding whether to pass or bid four of the major (remembering that an opposing overcall is seldom based on a solid suit, with which opponents tend to pass in the hope of defeating a notrump contract). When the overcall is in diamonds, 3C is Stayman and 3D is a transfer to hearts (the exception to the cue bid's being Stayman): South West North 1NT 2D 2H/2S - natural, sign-off 2NT - Rumpelsohl 3C - Stayman 3D - transfer to hearts 3H - transfer to spades 3S - transfer to clubs Using 3C as Stayman lets opener bid 3D to deny a major, enabling responder to show a five-card major if he has one. South West North 1NT 2H 2S - natural, sign-off 2NT - Rumpelsohl 3C - transfer to diamonds 3D - transfer to spades 3H - Stayman, four spades 3S - transfer to clubs South West North East 1NT 2S 2NT - Rumpelsohl 3C - transfer to diamonds 3D - transfer to hearts 3H - transfer to clubs 3S - Stayman, four hearts Over the 3H transfer to clubs, opener can bid 3S if in doubt whether to bid 3NT or 4C. Responder can take this as asking for a partial stopper or better in spades. Responder can show a second suit after transferring: South West North East 1NT 2C 3H Pass 3S Pass 4H/4D - second suit When responder shows spades and hearts via a transfer sequence, she is probably at least 5-5 in the majors and not interested in slam. With slam interest, responder shows a major two-suiter via Stayman: South West North East 1NT 2C 3C Pass 3D Pass 3S Pass 3NT Pass 4H This sequence is preferred with slam interest because it gives opener a chance to make a cue bid in support of spades. Opener can bid on over the 4H bid with a suitable hand. It does result in a lead through opener's strength in the opposing suit, so responder might prefer to transfer with, say, two small cards in the opposing suit. Responder uses the Unbalanced Heart Convention (UHC) with an unbalanced two-suiter that includes hearts and a minor: South West North East 1NT 2S 3D Pass 3H Pass 3S - UHC, not a cue bid 3NT Pass 4C/4D - second suit 4H - six hearts, slam interest The 4H bid shows at least six hearts and slam interest, in an unbalanced hand. If not interest in slam, North would have made a Texas transfer over 2S. If balanced, she would have raised 3H to 4H, also showing slam interest. There are also two ways to show long hearts: South West North East 1NT 2D 3C Pass 3H Pass 4H The 3C response is a transfer to hearts, and the 4H rebid shows six or more hearts, slam interest, balanced hand. North would have used Texas (a 4D response) with no slam interest, and with an unbalanced hand he would have used the Unbalanced Heart Convention (UHC) to give opener an opportunity to make a cue bid: South West North East 1NT 2D 3D Pass 3H Pass 3S Pass 3NT Pass 4H Negative Doubles The negative double is recommended as a companion to Rumpelsohl. Like Rumpelsohl, negative doubles apply only against a natural overcall (through 2S, at least). A negative doubler needs at least 11 HCP, maybe 10 HCP with a good suit, since he must be able to support a 2NT contract if opener bids it. A double of 2C is permitted with only 9 HCP, provided responder has at least four cards in each unbid suit. (Opener must bid 2S, 2H, 2D, or pass the double). Since opener may pass the double with four cards in the opposing suit, don't double if you would not welcome a pass. A negative double of one major implies four cards in the other major, and not enough strength for game forcing Stayman. A negative double of a minor implies both majors, but may be a sort of Stayman with one major only and another bid in the hip pocket in case opener bids the other major. South West North East 1NT 2D Dbl Pass 2H/2S - four-card major, minimum hand 3H/3S - four-card major, maximum hand Pass - four diamonds 2NT - no major, minimum or poor diamonds 3NT - no major, maximum hand 3C - five clubs, no diamond stopper When opener responds to the double with a minor suit, he denies a stopper in the opposing suit. When a negative doubler follows with a (game-forcing) cue bid, he denies a stopper in the opposing suit. Opener must then further describe his hand in some way, bidding notrump only with the opposing suit stopped: South West North East 1NT 2D Dbl Pass 2H Pass 3D - no diamond stop 3H - five hearts or four strong, no stopper 3S - four weak spades or three strong, no stop 3NT - diamonds stopped 4C - four clubs, no diamond stopper A notrump bid following a negative double is natural (even 4NT). When a Stayman Bid Gets Doubled South West North East 1NT Pass 2C Dbl -- Opener redoubles with four clubs to an honor, or better. Responder can then pass the redouble if she thinks 2C will make. -- Opener passes the double with three clubs to the queen or better, or four small. Responder can then pass (with a non-game hand) or redouble (if there is potential for game) if he thinks 2C will make. The reason for not redoubling with a weakish hand is that the opponents might run to a better contract. -- Opener makes his normal bid over the double with a doubleton club, or three weak clubs. With a minimum hand and a four-card major, opener may choose to bid the major instead of passing or redoubling. Otherwise a major fit could be lost if responder can only bid 2NT: South West North East 1NT Pass 2C Dbl Rdbl Pass 2NT - can't play clubs If opener must pass 2NT with a minimum hand and a four-card major, a 4-4 fit in the major could be missed. With a maximum hand opener can always afford to pass or redouble, since he can bid a major at the three level if responder bids 2NT. North has a very weak hand in the following auction: South West North East 1NT Pass 2C Dbl Pass Pass 2D North has S-J873 D-Q864 D-98632 C- void. With a game try hand or better, North must not bid 2D. He can bid a five-card major (forcing) or 2NT (invitational). With a game-going hand he can bid 3C to repeat the Stayman request. When a 2D Response to Stayman Gets Doubled South West North East 1NT Pass 2C Pass 2D Dbl Responder's actions are similar to opener's actions when a Stayman 2C bid gets doubled: -- With four diamonds headed by an honor, or better, he redoubles. -- With three diamonds to the queen or better, or four small, he passes. -- With less in diamonds, he makes his normal bid. With 11-12 HCP and a five-card major to show, responder may choose to bid the major rather than pass or redouble. Otherwise the major could be shut out if opener bids 2NT, because responder would have to pass. With a game-going hand or better responder can safely pass or redouble, since he can bid a five-card major at the three level (forcing) if opener bids 2NT. South West North East 1NT Pass 2C Pass 2D Dbl Pass Pass Rdbl - natural, wanting to play 2D 2NT - minimum hand, no four-card major 2H/2S - four-card major previously repressed (possibly a strong three with no diamond stopper) Pass is not permitted North's pass shows at least Qxx or four small diamonds, so the redouble is to play. A pass by South is impossible here because North's hand is unlimited. The score resulting from making two diamonds doubled might not be enough to make up for a missed game. When Responder's Major Suit Rebid Gets Doubled South West North East 1NT Pass 2C Pass 2D Pass 2H/2S Dbl This is probably one of those occasions when North is deceptively bidding a non-suit. South should redouble with a double stopper in the suit, pass with no stopper, and make the normal bid with a single stopper. If South passes, no bid by North in another denomination is forcing, so he must not make a minimum bid with a game-going hand: South West North East 1NT Pass 2C Pass 2D Pass 2S Dbl Pass Pass 3C/3D - sign-offs 3H - invitational 3S - partial spade stop Rdbl - to play South has denied a spade stopper with the pass. The 3S bid can't be natural, so it asks for a partial spade stopper, with which South bids 3NT. The 3C and 3D bids are sign-offs. The 3H bid is unlikely--what sort of hand could North have? Maybe S-65432 H-KQJ108 D-Q3 C-6. When A Transfer Bid Gets Doubled South West North East 1NT Pass 2D/2H/2S Dbl -- With a partial stopper (e.g., Qx, Jxx) or worse in the doubled suit, opener passes. Responder should play the hand, if possible, so that the doubler will be on lead. If the double gets passed around, responder can redouble to force opener to bid the indicated suit. The redouble says nothing about the opposing suit, and of course responder may be busted. To invite game, responder can "cue bid" the doubled suit (forcing the transfer at the same time) or jump in the indicated suit. If responder merely bids the indicated suit at a minimum level, perhaps holding something like Qx in the doubled suit, opener must pass. -- With a single stopper or better, opener redoubles if he doesn't want to accept the transfer. -- A suit bid by opener (accepting the transfer) is non-committal. He may or may not have a stopper in the doubled suit. When a Transfer Bid Gets Overcalled South West North East 1NT Pass 2D 2S Opener can bid only with a maximum and good support for responder's indicated suit (hearts, in this auction). Otherwise he must pass, since responder could have a bust hand. Or he can double, if he is confident of defeating the contract with no help from responder. A second suit is not forcing if the bid follows an opposing overcall, and a double is artificial, a game try. Bidding the suit is merely competitive, not invitational: South West North East 1NT Pass 2H 3C Pass Pass 3D/3H - weak Dbl - interested in game 3S - not invitational If North were to pass with a fair but not invitational hand containing six spades, or a weakish 5-5 with which he planned to pass 2S, South would probably have to pass also. North therefore competes with a three-level bid. With an invitational hand, or a game-going two-suiter, North must double. All the double says is, "I have at least a game-invitational hand:" An invitational two- suiter is not shown via Jacoby, so a new suit bid after the double is forcing to game. Suppose the overcall comes after a double showing a one-suited hand: South West North East 1NT Dbl 2H Pass 2S 3C 3D/3H/3S - weak The conventional double showing a one-suited hand is usually ignored by responder, and all bids retain the same meaning as if the double had not occurred. The 2H bid is therefore a transfer to spades. Any three-level bid by North in this situation is merely competitive, not invitational. Responder may choose to redouble with 10 HCP or more, but with game prospects and a four-card or longer major it may be better to make the normal response rather than redouble. South West North East 1NT 2C 2D Pass 2H 2S Dbl Pass 2NT - minimum, poor hearts, spades stopped 3NT - maximum, poor hearts, spades stopped 3H - minimum hand, heart support 4H - maximum hand, heart support 3C/3D - poor hearts, no spade stopper Pass - short hearts, good spades West's 2C bid was "Hamilton," showing a one-suited hand. This convention is ignored (except that a double is Stayman), so 2D is a transfer to hearts. The 2S bid reveals that West's suit is spades. North doubles (artiificially) to show a hand of game- invitational strength or better. South then bids according to his hand, as shown. If North next bids a new suit, that is forcing to game (showing a two-suiter via Jacoby is a game force), but a 3H bid over opener's 2NT is not forcing.