DISTURBING OPPONENTS NO TRUMPS it is a creation of Marty Bergen used by
Bergen-Cohen partnership that allow us be competitive against their strong NT
opening. Not recommended against weak NT (12-14 hcp) because there are
no option for punish their NT.
Opener Overcaller
double shows one suit of 5/6 cards - not penalty - partner should
bid 2
2
means 2 suits 5-5 or 5-4: Clubs and other
2
means 2 suits 5-5 or 5-4: Diamonds and a major
2
means 2 suits 5-5 or 5-4: both majors
2
means long weak 6
cards (if good hand then x first then 2)
3
7 cards preemptive
3
7 cards preemptive
3
7
cards preemptive
3
7 cards preemptive
Criteriums to overcall for one suit:
maximum = 2 top honors and A or K in other suit - around 11 hcp
xx AQJxxx
xx Q10x
min <= 2
xx QJ10xxx
Ax J10x
min <= 2
xx KQJ10xx
Ax Q10x
max <= 2
xx AKQ10x
Ax J10x
max <= 2
K109xxx x
Kx Jxxx
min <= 2
AK109xx x
KJx Jxx
max <= double and after 2
J9xxx x
AKx Jxxx
not qualified - honors must be in the suit bided
A Q1054x
KJx Qxx
not qualified
- honors must be in the suit bided
level 3
KQJ98xx xx
xx xx
min <= 3
for nVul against Vul
xx KJ10876xx
xx x
min <= 3
for nVul against Vul
xx x
AK10987x Q10x
max <= 3 same
Vulnerability
Qx x
Axx AKQ1098x
max <= 3 Vul against
nVul
Criteriums to overcall with 2 suits:
maximum = around 11 hcp with 5-5 cards and 2 top honors in both suits,
in fact a good suit need middle cards J, 10, 9 to be powerful:
KQ98x AQ10xx
xx x
max <= 2
x KQ9xx
AK9762 x
max <= 2
xx KQJ10x
x AQ10xx
max <= 2
xx AQ108x
AQ109x x
max <= 2
minimum = less than 11 hcp and missing 2 top honors in at least one suit
K98zx K107xx
xx x
min <= 2
x KQ9x
KJ876 xx
min <= 2
KJ10x KQJ10x
x xxx
min <= 2
xx AK108
Q1098x Qx
min <= 2
D.O.N..T is to be used nVul, but if you use it Vul you must have a
maximum hand with good middle cards!
RULE#1
- After overcall DONT with double if partner bids a suit this is a
sign-off with very good 6/7 cards, so overcaller must pass.
Opener Overcall Responder Advancer
1NT 2
double 2/2/2
<= sign-off
RULE#2
- After overcall DONT
showing 2 suits if Responder double, partner pass accepting to play in
that suit but if partner redouble he is asking for partner bid the other
suit and if that other is also doubled then another redouble is asking
to overcaller bid other suit even it is 2 cards suits.
Opener Overcall Responder Advancer
1NT 2
double pass <= I accept this suit -
you may pass
Overcall: Q10xxx 8
Q10 KJ10xx
Advancer: xx K109x
Kxxx 963
Opener Overcall Responder Advancer
1NT 2
double redouble <= bid other suit
pass 2
double pass <= I accept this suit -
you may pass
Overcall: xx KJ9x 8x AQ10xx
Advancer: J98x
108xx
A84x x
Opener Overcall Responder Advancer
1NT 2
double redouble <= bid other suit
pass 2
double redouble <= bid other suit
pass 2
double pass
Overcall: Jx 8
Q1098x AQ10xx
Advancer: Q98xxx K1098xx
x -
CAN DONT OVERCALL
START A TRY FOR GAME?
Well this is very difficult but when a good fit is found and the
distribution it is very favourable this can happen. Thus after the
overcall Advancer (the overcaller partner) bids 2nt asking for the hand:
Opener Overcaller Responder Advancer
1NT 2
pass 2NT <= asking
to explain hand
pass ?
3
<= minimum and Clubs can be 4 cards
Advancer pass or bid 3
asking for second suit
Overcaller pass in 3 or
bid his second suit to sign-off
3
<= maximum with both minors
3
<= maximum 5-5
Advancer decide game or partial score
3
<= maximum 5-5
Advancer decide game or partial score
Opener Overcaller Responder Advancer
1NT 2
pass 2NT <= asking
to explain hand
pass ?
3
<= minimum with Diamonds and Hearts - may be 5-4
Advancer bids 3 sign-off
or 3
sign-off or even bids 4
3
<= minimum with Diamonds and Spades
Advancer pass in 3 or
sign-off in 3
or even bids 4
3
<= maximum 5-5
Advancer decide game or partial score
3
<= maximum 5-5
Advancer decide game or partial score
Opener Overcaller Responder Advancer
1NT 2
pass 2NT <= asking
to explain hand
pass ?
3
<= minimum with Hearts better than Spades - may be 4-5
Advancer bids 3
sign-off or 3
sign-off or even bids 4/4
3
<= minimum with Spades better than Hearts - may be 5-4
Advancer bids 3
sign-off or 3
sign-off or even bids 4/4
3
<= maximum 5-5
with Hearts better than Spades
Advancer bids game 4/4
or
3
<= maximum 5-5
with Spades better than Hearts
Advancer bids game
4-4
Opener Overcaller
Responder Advancer
1NT double
pass 2<=relais
asks partner to show his suit
pass ?
pass <= shows 6 cards
2 <=
shows 6 cards
2
<= shows 6 cards
2 <=
shows 6 cards
After Overcaller shows his suit if Advancer raise to level 3
this is an
invitation to game showing 4 cards support.
Opener Overcaller Responder Advancer
1NT
double pass
2NT <= asking for hand's strength
pass ?
3 <=
mínimo
Advancer bids 3 and
Overcaller pass or correct
to 3
/ 3 / 4
3 <=
maximum with Diamonds
3
<= maximum with Hearts
3 <=
maximum with Spades
3NT <= maximum with Clubs
Note: when Advancer has balanced hand with 14 hcp he may pass in
overcaller double without know the suit in a way to punish Opponent.
Example:
K10x A1098
KJ10 QJx
or K10x J1083
AJ10 KQx
DEFENSE AGAINST DONT
When opponent interfere in our NT opening with DONT bidding double
we could ignore the double:
Responder Advancer Opener Overcaller
1NT double
2 <= normal Stayman
2 <= transfer to Hearts
2
<= transfer to Spades
2 <= transfer to Clubs
2nt <= transfer to Diamonds
3
<= your convention ...
When opponent interfere in our NT opening with DONT bidding a suit we
should use Lebensohl or any other convention that we are familiar.
Responder Advancer Opener Overcaller
1NT 2
<= DONT 2 suits
double <= penalty
2 <= sign-off long
Diamond weak suit
2
<= sign-off long Hearts weak suit
2 <=sign-off long Spades
weak suit
3 <= Stayman
3 <= GF 5+
cards
3
<= GF 5+
cards
3 <= GF 5+
cards
3nt <= to play
4
<= Gerber - asking for aces
4 <= transfer to 4
4 <= transfer to 4
/ / /