查看完整版本 : Jacoby transfer(必知叫法)

alexskt 2007-10-29 07:26 PM

Jacoby transfer(必知叫法)

[b][size=5][color=navy]Introduction:[/color][/size][/b]

[size=3]The Jacoby transfer, in the card game [/size][url=http://en.wikipedia.org/wiki/Contract_bridge][size=3][color=#810081]contract bridge[/color][/size][/url][size=3], is a [/size][url=http://en.wikipedia.org/wiki/Convention_%28bridge%29][size=3][color=#0000ff]convention[/color][/size][/url][size=3] initiated by a responder following partner's no trump opening bid. Nowadays the term "Jacoby" is rarely used, especially outside North America, and the convention is simply called a "[color=blue]transfer[/color]".[/size]

alexskt 2007-10-29 07:28 PM

[b][size=5][color=navy]Transfer Bid:[/color][/size][/b]


[size=3]The transfer procedure is quite simple and is described first [b][u][color=red]in response to a 1NT opening bid[/color][/u][/b]:[/size]
[list][*][size=3][color=darkgreen][b][u]Holding a 5-card major suit[/u][/b][/color], responder would traditionally bid 2, 3 or 4 of that suit depending on strength; using transfers, responder will instead bid 2 of the suit [i]below[/i] the major suit [/size][*][size=3]Partner (opener) must then bid 2 of the next suit up (ie the major suit in question) [/size][*][size=3]Examples: [/size][list][*][size=3]1NT - [color=red]2D [/color](I have a [color=red]5-card heart suit partner[/color]) - opener must rebid 2H [/size][*][size=3]1NT - [color=blue]2H[/color] (I have a [color=blue]5-card spade suit partner[/color]) - opener must rebid 2S [/size][/list][/list][size=3]An immediate disadvantage of this method is that it is incompatible with a weak take out into 2D, although as with the loss of the 2C weak take-out when using [/size][url=http://en.wikipedia.org/wiki/Stayman][size=3][color=#0000ff]Stayman[/color][/size][/url][size=3], this is not generally considered a serious loss.[/size]

alexskt 2007-10-29 07:30 PM

[b][size=5][color=navy]Subsequent Standard Bids:[/color][/size][/b]
[b][size=5][color=#000080][/color][/size][/b]
[b][color=#000080][/color][/b]
[size=3]After the transfer has been completed by the 1NT opener, subsequent bids by the transfer initiator are:[/size]
[list][*][size=3][color=indigo]Weak hands[/color][/size][list][*][size=3][color=red]Pass[/color], to play a partial game in the transferred suit [/size][/list][*][size=3][color=blue]Invitational hands[/color] [/size][list][*][size=3]2NT, giving the strong partner the option of continuing to game or playing a partial game, in either no trump or the transferred suit [/size][*][size=3]3 of the transferred suit, promising a six-card suit [/size][/list][*][size=3][color=darkgreen]Game strength hands[/color] [/size][list][*][size=3][color=red]New suit, showing 5-4 or 5-5 and game forcing[/color] [/size][*][size=3]3NT, allowing opener a choice of 3NT or 4 of the major [/size][*][size=3]4 in the transferred suit, to play promising a six-card suit[/size][/list][/list]

alexskt 2007-10-29 07:32 PM

[b][size=5][color=navy]Non-Standard but Common Subsequent Bids:[/color][/size][/b]


[size=3]Since a [color=red][color=navy]2S response[/color] is no longer required for a weak take-out into spades, its use has been adopted in two ways:[/color][/size]
[list][*][size=3]Simple use of the 2S response is to split the traditional 2NT response in a precise HCP way eg for [/size][url=http://en.wikipedia.org/wiki/Acol][size=3][color=#0000ff]Acol[/color][/size][/url][size=3] (1NT = 12-14 HCP): [/size][list][*][size=3][color=darkgreen]1NT - 2S[/color] = I have a balanced hand and exactly 11 HCP [/size][*][size=3][color=darkgreen]1NT - 2NT[/color] = I have a balanced hand and exactly 12 HCP [/size][/list][*][size=3]This has been further refined to include the use of the 2S bid as a means of transferring into a minor suit, thus for Acol: [/size][list][*][size=3]1NT - 2S (I may have 11 HCP or I may have a long minor suit) - opener rebids: [/size][list][*][size=3]2NT with a weak hand (ie (12 HCP) - partner then choses between passing or bidding a minor suit. [/size][*][size=3]3C with a strong hand (14 HCP) - partner then choses between 3NT, passing or bidding diamonds.[/size][/list][/list][/list]

alexskt 2007-10-29 07:34 PM

[b][size=5][color=navy]Transfers Following a Double:[/color][/size][/b]


[size=3]Following a double ([color=blue]partner opens 1NT, opponent doubles[/color]) there are two options in fairly common use:[/size]
[list][*][size=3]Transfers and Stayman become inoperative ie all 2 level bids are for take-out. This has the advantage of simplicity but the disadvantage that the stronger hand becomes dummy with a resultant offering of information to opponents. [/size][*][size=3]All 2-level bids become transfers according to this scheme (known as "exit transfers" in some quarters): [/size][list][*][size=3][color=red]redouble transfers to 2C[/color]. [/size][*][size=3][color=darkgreen]2C transfers to 2D[/color]. [/size][*][size=3][color=green]2D transfers to 2H[/color]. [/size][*][size=3][color=teal]2H transfers to 2S.[/color] [/size][*][size=3][color=blue]2S (Acol - I have 11 HCP) transfers to NT at the appropriate level[/color]. [/size][*][size=3][color=sienna]2NT (Acol - I have 12 HCP)[/color] [/size][/list][/list]reference: 轉帖from wikipedia

[[i] 本帖最後由 alexskt 於 2007-10-29 07:47 PM 編輯 [/i]]

szekei2 2007-10-30 12:20 PM

How about the various ways of super-accept?

alexskt 2007-10-30 06:01 PM

[quote]原帖由 [i]szekei2[/i] 於 2007-10-30 12:20 PM 發表
How about the various ways of super-accept? [/quote]


Sorry, what do you mean by "various ways of super-accept" ?

szekei2 2007-10-30 10:13 PM

N    E    S    W
1NT  P   2H   P
?

In order to make the topic complete, I suggest you to explain the meaning of a bid of 3S by the opener after the 2H transfer by responder.

Besides, what if the opener bid 2NT/3C/3D/3H after the responder make the transfer bid?  Any idea?

[[i] 本帖最後由 szekei2 於 2007-10-30 10:17 PM 編輯 [/i]]

alexskt 2007-10-31 05:53 PM

回覆 #8 szekei2 的帖子

[font=Arial][b][b]Assume Bidding is 1NT - 2H [/b][/b][/font]
[table=98%][tr][td=1,1,42][img=15,15]http://www.slospin.net/_themes/pstmdrn/posbul1d.gif[/img][/td][td][font=Arial, Helvetica][font=Arial][size=12pt][b]2S= 2 or 3 spades, any strength [/b][/size][/font][/font]
[/td][/tr][tr][td=1,1,42][img=15,15]http://www.slospin.net/_themes/pstmdrn/posbul1d.gif[/img][/td][td][font=Arial, Helvetica][font=Arial][size=12pt][b]3S= 4 or more spades, with or without ruffing value, non-maximum [/b][/size][/font][/font]
[/td][/tr][tr][td=1,1,42][img=15,15]http://www.slospin.net/_themes/pstmdrn/posbul1d.gif[/img][/td][td][font=Arial, Helvetica][font=Arial][size=12pt][b]2N= 4 spades, 4/3/3/3, no ruffing value (no doubleton), maximum [/b][/size][/font][/font]
[/td][/tr][tr][td=1,1,42][img=15,15]http://www.slospin.net/_themes/pstmdrn/posbul1d.gif[/img][/td][td][font=Arial, Helvetica][font=Arial][size=12pt][b]3C= 4 or more spades, doubleton club, maximum [/b][/size][/font][/font]
[/td][/tr][tr][td=1,1,42][img=15,15]http://www.slospin.net/_themes/pstmdrn/posbul1d.gif[/img][/td][td][font=Arial, Helvetica][font=Arial][size=12pt][b]3D= 4 or more spades, doubleton diamond, maximum [/b][/size][/font][/font]
[/td][/tr][tr][td=1,1,42][img=15,15]http://www.slospin.net/_themes/pstmdrn/posbul1d.gif[/img][/td][td][font=Arial, Helvetica][font=Arial][size=12pt][b]3H= 4 or more spades, doubleton heart, maximum [/b][/size][/font][/font]
[/td][/tr][/table]

[[i] 本帖最後由 alexskt 於 2007-10-31 05:56 PM 編輯 [/i]]

alexskt 2007-10-31 05:57 PM

This website can provide you more information on Jacoby Transfer. Please have a look

[url=http://www.slospin.net/Duplicate%20Bridge/Bridge%20Conventions/bridge_maj_xfer.htm]http://www.slospin.net/Duplicate%20Bridge/Bridge%20Conventions/bridge_maj_xfer.htm[/url]
頁: [1]
查看完整版本: Jacoby transfer(必知叫法)