cf_John0

1,The similar 2C opening also can be seen in Precision system or Polish WJ system ; 2,"an unbalanced 17-20 with primary clubs and another suit " is impossible directly show,but is simply to show indirectly; 3,something contradicted itself?

Under the guide of methodology: M-Tribe Bidding System with limited art-open,reasonable response & rebidding,and usual conventions 1d:12~16,natural;4/+ 1h/s/:10~16,natural;Majors' rule of 19,54/+ 1nt:weak,13~15,bal;w/o 5M ♣♣♣♣ 2c:21+,strong w/t 6+ suit;or 12~16;5c+/4Major 2 suiter; F1 w/t 2D weak response ♦♦♦♦ 2d/h/s:6/+ one suiter;or 2-suiter 5-5+equiv w/t major suit; under 11hcps NF w/t pass response ♥♥♥♥ 2nt:both minor 5-5 suiters under 11hcps; or bal 21~22 ; F1 w/t 3c ask ♠♠♠♠ 1c:other hands,12hcp+; 12~16,prepare not weak 1nt; 12~16,natural;club 5+,only one suiter 17~20,bal; 17~20,un-bal; 23/+,bal; F1 w/t 1D weak response ♣♣♣♣ 3x:usual,7/+ NF w/t 3nt/4c asking ♦♦♦♦ 4c:minor preempts 4d/h:Texas preempts 4s:bizarre minors hands asking Keycards 4nt:bizarre majors hands asking Keycards

2♥ for NT-game trial firstly,

1♠ in my new systems,for better contract.

Dbl 4♣,then rebid 5♣ for 4♥,then 6♥, The hand is good enough for dbl-then-rebid,I think.

1♠ is very good.

I don't thnik that pass is beter than dbl.

Take out bdl for 1)

If not 3♠,might 1♥ be acceptable.

Yes,I think so,too.

Direct 2♦ seems weak,and dbl then rebid is just OK.

Both minors of 4♦/4+♣,and with negative dbl HCPs.

1♠ for anytime,3♣ ia a good rebid for any response;they are typical,I think.

2♠ for PD's options from pass,3♦,3♥,or else

North should bid 3NT after PD's 3♦