This blog provides supplementary thoughts and ideas to the site. If you haven't seen the main site, there is a lot there including the Martel and Rodwell interviews, photos, and articles. This blog is focused on advancing bridge theory by discussing the application of new ideas. All original content is copyright 2009 Glen Ashton.

Thursday, September 04, 2008

Transfers over 1C in ACBL general convention chart events

Simply put, you have to modify a standard system too much to get transfers over 1C - the starting point is to make 1C 15+, which then has unbalanced Cs 11-14 moved to 2C, which then requires moving the standard 2C hands somewhere etc.

You can play half transfers under the General Convention Chart - say 1C is 1Cs or balanced 12-14 or 18-19, and now:

1D: transfer to Hs, 4+Hs, may have longer minor
-- 1H: 3Hs, less than 17
---- 2C: asks opener to bid 2D, then pass with D signoff, any other bid a game invite
---- 2D: artificial game force with Hs (or if all game forces go via 1C-1H, then natural, game invite)
---- 2H, 2S, 3C: signoffs (2H is mild invite since can pass 1H)
-- Rest: as over 1C-1H in standard, but 1S, 1NT and 2C deny 3+Hs.

1H: any game force
--1S: waiting, less than 16
---- 1NT etc. natural, game force
--Rest: 16+, natural bidding

1S: natural, 4+Ss, may have longer minor

1NT: less than a game invite, no 4cM, natural

2C: 4+Cs, unbalanced if less than a game invite, no 4cM, less than a game force, not 6+Cs if game invite
-- Pass: 4+Cs (or 3Cs and 2Ds), would not accept game invite
-- 2D: less than 4Cs, at least 3Ds, 12-14 balanced.  2NT and 3D are natural, game invites.
-- 2H/S: value showing, forcing, would accept game invite
-- 2NT: 4Cs, 12-14 balanced, maximum
-- 3C: club fit, would accept game invite, non-forcing
-- 3D/H/S: shows singleton/void, club fit, forcing to 3NT or 4C
-- 3NT: 18-19 balanced - if a weak major prefer to bid 2H/S

2D: 6+Ds, no 4cM, less than a game invite

2NT: Game invite with no 4cM.  Prefer 2C if 4-5Cs and a weak side suit.

3C/D: 6+ minor, no 4cM, game invite


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