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what does "system on" mean?

#1 User is offline   MTSummit 

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Posted 2009-December-05, 12:23

hello, i found it in conventional card but don't know what it really means.
could anyone help me? thanks!
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#2 User is offline   dicklont 

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Posted 2009-December-05, 12:32

1. When you open 1NT and left hand opponent doubles, responders call mean the same as without the double.
1NT - (Dbl) - 2 = stayman, 2 transfers for etc.

2. When you overcall 1NT and left hand passes, responders call mean the same as after opening 1NT
(1) - 1NT - (pass) - 2  = stayman, 2 transfers for etc.
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#3 User is offline   helene_t 

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Posted 2009-December-05, 12:32

it usually refers to the situations

1NT-(dbl)-?
where it means that we bid as if the opponent has passes instead of doubled, i.e. transfers and stayman etc apply.

and/or

(1)-1NT-(pass)-?
where it means that we bid as if partner had opened 1NT rather than overcalled, ie. stayman, transfers etc apply. (the opening bid could also be some other suit, is just an example).

Wellcome to the forum btw !
The world would be such a happy place, if only everyone played Acol :) --- TramTicket
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#4 User is offline   gwnn 

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Posted 2009-December-05, 12:40

Many people play system on over 1NT-(2), as long as 2 didn't promise both majors.
i.e. double=stayman, 2=hearts, etc
... and I can prove it with my usual, flawless logic.
      George Carlin
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#5 User is offline   MTSummit 

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Posted 2009-December-05, 12:44

thanks dicklont & helene_t,

the next question is, if i agree system on for both situations, should i write on cc "system on over double and overcall" or something similar?
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#6 User is offline   helene_t 

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Posted 2009-December-05, 13:15

MTSummit, on Dec 5 2009, 07:44 PM, said:

thanks dicklont & helene_t,

the next question is, if i agree system on for both situations, should i write on cc "system on over double and overcall" or something similar?

System on over overcall sounds as if it applies when p opens 1nt and they overcall.

Better put it in the relevant secotions. Under defensive bidding, put 1NT=15-18 (system on)
The world would be such a happy place, if only everyone played Acol :) --- TramTicket
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#7 User is offline   MTSummit 

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Posted 2009-December-05, 13:37

helene_t, on Dec 5 2009, 02:15 PM, said:

MTSummit, on Dec 5 2009, 07:44 PM, said:

thanks dicklont & helene_t,

the next question is, if i agree system on for both situations, should i write on cc "system on over double and overcall" or something similar?

System on over overcall sounds as if it applies when p opens 1nt and they overcall.

Better put it in the relevant secotions. Under defensive bidding, put 1NT=15-18 (system on)

thx for advice! :rolleyes:
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#8 User is offline   MTSummit 

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Posted 2009-December-05, 13:39

gwnn, on Dec 5 2009, 01:40 PM, said:

Many people play system on over 1NT-(2), as long as 2 didn't promise both majors.
i.e. double=stayman, 2=hearts, etc

y, i'm also customed with this
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