Sunday, June 7, 2015

Yet another stab at direct 1NT Overcall System


1NT Direct Overcall
In direct seat 1N shows 15-18 hcp balanced with a stopper, 15 hcp hands are included to protect against light openers where you have no good bud.  A takeout double is made if a double is more suitable.
1N by a passed hand shows a 2-suiter in the lower unbid suits, possibly with the lowest suit being longer (at least 5-5 in length).
 
Responses:
For 1N overcalls you’re unlikely to want to play in opener’s suit so using transfers, a transfer to opponent’s suit is used artificially as Stayman. All 2-level suit bids are transfers, with a transfer to opener’s suit being Stayman and 2♠ being a transfer to ♣ (or to ♦ over 1♣ opening with 2♣ then being Stayman). Overcaller completes the transfer without 4M and a minimum, bidding 2N without a 4M and a maximum.  With a maximum and a 4-card major, overcaller jumps in the major, except over 1♣/1♦ opening. Over a 1♣/1♦ opening overcaller cuebids with a maximum and both 4-card majors.
2N is INV.
3♣ shows both minors over 1♣ and is NF. A jump cuebid is a 6+card suit and INV including minor suit cuebids, Major suit jump cuebids are minor suit Stayman.
Transferring to a  major and then rebidding 3M is INV with no help in opponent's suit so is wary of NT. Transferring to a major and bidding a lower suit is at least 5-5 and INV.
When advancer transfers to a minor, overcaller completes the transfer with a good holding and makes the bid in between. After (1♣)-1N-2♠ 2N shows very good ♦ stoppers and other bids are normal.
Gerber is 4♣, 4♦/4♥ are Texas transfers, with a Texas transfer to opener’s suit meaning opponents have misbid/misclicked.


 


2♣


2♦


2♥


2♠


2N


3♣


3♦


3♥


3♠


1♣-1N


Stayman








INV


INV ♣


INV ♦


INV ♥


INV ♠


1♦-1N


Stayman








INV


INV ♣


MSS


INV ♥


INV ♠


1♥-1N




Stayman






INV


INV ♣


INV ♦


MSS


INV ♠


1♠-1N






Stayman




INV


INV ♣


INV ♦


INV ♥


MSS

 
Opponents double 1N:
Pass - suggested place to play, overcaller may bid 5-card suit, pass or redouble with doubt, then responder can leave 1NXX in or bid 4-card suits up the line till at least a 4-3 fit found, possibly playing in opener’s suit.
Redouble - transfer to ♣ even after a 1♣ opening. If responder next bids 3♣ it is INV.
2♣/2♦/2♥ - transfer to above suit, even if it is opener’s suit. If responder’s next bid is a raise or 2N is INV
2♠ - natural and constructive, overcaller may compete to 3-level with a fit if pushed
2N - both minors, usually weak, but may investigate for game by bidding their short major
3 bids - natural and preemptive, with a jump cuebid having no meaning
3N - to play
Gerber is 4♣, 4♦/4♥ are Texas transfers
 
If 1N gets doubled in balancing seat then:
Overcaller’s partner redoubles for SOS
Pass to play, other bids natural and non-forcing, including cue-bids
 
Opponents bid again at 2-level:
Doubles are negative, doubling then cuebidding usually has some minor suit length
2 level suit bids are natural and to play, even a cuebid
Transfer Lebensohl is used for 2N, 3N and 3-level suit bids
3-level transfer cuebids are Stayman with a stopper (double without a stopper)
Gerber is 4♣, 4♦/4♥ are Texas transfers (with a Texas transfer to opener’s suit being minor suit Stayman usually with no slam interest)