The GIB robots on BBO use the 2/1 system described below.
You can click on any of GIB's bids for an explanation.
Please drop us a line at
support@bridgebase.com
if you spot any errors in this document.
Overview
2/1 Game Force with 5 card majors, strong NT, strong (17+) jump shift, weak 2
bids and a strong artificial 2C.
Carding is 3/5, with what appears to be standard count and attitude signals.
Gib does falsecard.
HCP vs Total Points
Gib uses both old fashioned HCP (A=4,K=3,Q=2,J=1)) and “Total points” (HCP+3
for void, 2 for singleton, 1 for doubleton). It sometimes uses “8421” points
when cuebidding (A=8,K=4,Q=2,J=1). It will usually force to game if it thinks
it has 25 Total Points between the two hands.
Opening bids
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1C
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could 3 if 4333. 2C response is forcing, inverted
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1D
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usually 4 unless 4432. Opens 1D with 4-4 in the minors. 2D response is
forcing, inverted
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1H 1S
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normally show 5 in all seats. Opens 1S with 5-5 in spades and clubs.
1M-2M direct raise is not constructive. 1N response is forcing. Jacoby
2NT. Splinters. Long suit game tries (when hearts is agreed, 3C/3D =
long suit game try)
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1N
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balanced 15-17 HCP, denies a 5-card major.
Followups:
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2C
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strong, artificial. 22+ HCP
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2D 2H 2S
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weak 2 bid. Disciplined, with honors in the suit
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2N
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balanced 20-21 HCP.
Followups:
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Rebids
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Opening jump rebid (1c-1any-3c for example) promises 6+ card, 17-20 HCP
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Opening major rebid does not promise 6 cards in the suit.
Competitive Auctions
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1-level overcall shows 5+; 8-17HCP; 9-19HCP. However, might overcall
1-major with decent hand and a strong 4-card suit.
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GIB uses the law of total tricks.
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Takeout doubles to 4 level
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Negative X. Responsive X. Support X (GIB may do support X with Kx).
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Weak jump overcalls (aggressive, 3-9 HCP, no allowance for vulnerability)
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Cappelletti when opponents open 1NT
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Michaels cue bid
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Unusual NT (GIB only does Unusual NT with intermediate hands, xx-KQxxxx
KQxxx for example))
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Unusual versus Unusual (GIB does UVU, but doesn't alert it with this name)
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Western Cue bid (GIB doesn't alert western cue with this name)
Other conventions and treatments
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Fourth Suit Forcing
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New minor forcing
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Roman
Key Card Blackwood. GIB doesn't like to use gerber, but it will
respond appropriately
Notes
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GIB is quite aggressive at the faster (weaker) settings. It likes to
redouble, so careful with those sacrifices.
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Vulnerability does not affect opening/overcall decisions. GIB seems to
consider vulnerability only when thinking about leaving in a double for
penalties.
Conventions that GIB does not play
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Drury, reverse Drury
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Gambling 3nt
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Namyats
Roman Keycard Blackwood
(RKCB)
RKCB is a 4NT bid that, unlike regular Blackwood, asks for "keycards" instead
of Aces. There are always 5 keycards - the 4 Aces plus the King of the agreed
trump suit. If no trump suit has been clearly agreed, the the King of the most
recently bid suit is typically counted as the 5th keycard.
Responses to 4NT RKCB:
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5C 0 or 3 keycards
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5D 1 or 4 keycards
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5H 2 or 5 keycards, but no Queen of the agreed suit
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5S 2 or 5 keycards plus Queen of the agreed suit
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5NT An even number of keycards plus an unspecified void
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6x An odd number of keycards with a void. If 6x is below 6 of the agreed
suit then the void is in the suit bid. If 6x is a bid in the agreed suit
then the void is in an unspecified higher-ranking suit.
After the 5C and 5D responses, the 4NT bidder can bid the next step that is
not a signoff in order to ask for the Queen of the agreed suit. Then:
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Bidding the agreed suit at the cheapest level denies the Queen of the agreed
suit.
-
Bidding a new suit promises the Queen of the agreed suit plus the King of
the suit bid.
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Bidding 5NT promises the Queen of the agreed suit and either denies any side
King or denies a side King that can be shown below 6 of the agreed suit.
A subsequent 5NT bid by the 4NT bidder (regardless of whether or not an ask
for the Queen of the agreed suit has taken place) asks for specific Kings. The
5NT bid promises that all of the 5 keycards and the Queen of the agreed suit
are accounted for. Then:
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The responder to RKCB is entitled to bid a grand slam if he thinks that 13
tricks rate to be available.
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If the responder to RKCB has a King that is lower-ranking than the agreed
suit, he should bid that suit at the 6-level. If he has more than one such
King, he should bid his lowest-ranking King.
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Otherwise the responder to RKCB should bid 6 of the agreed suit.
After a 1N opening bid
If the opponents overcall 2C (Cappelletti any 1suited hand), Double is
Stayman and all other bids as below.
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2C Stayman (promises at least one 4-card major
unless inviting 3NT).
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2D No 4-card major
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2H/2S Invitational with 5 of the suit bid and 4
of the other major
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2NT Invitational (does not
promise a 4-card major)
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3C/3D 5+ card suit. Forcing to game
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3H/3S Smolen (forcing to game with 4 of
the suit bid and 5 of the other major)
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4NT Invitational to 6NT.
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2H 4 hearts (could also have 4 spades)
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2S Invitational with 4 spades
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2NT Invitational, denying 4 spades
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3C/3D 5+ card suit. Forcing to game
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3H Invitational
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3S Artificial slam try with
at 4+ hearts, usually balanced
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4C/4D Splinters (singleton or void in the suit bid, 4+
hearts, interest in slam)
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4NT Invitational to 6NT
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2S 4S (denies 4 hearts)
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2NT Invitational (does not promise 4
hearts)
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3C/3D 5+ card suit. Forcing to game
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3H Artificial slam try
with 4+ spades, usually balanced.
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3S Invitational
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4C/4D/4H Splinters (singleton or void in the suit
bid, 4+ spades, interest in slam)
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4NT Invitational to 6NT
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2D Jacoby Transfer Bid (promises 5+ hearts).
Opener would normally bid 2H, but can superaccept with a maximum and 4-card
heart support. After 2H:
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2S 5+ hearts, 5+ spades, invitational
to game.
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2NT Exactly 5 hearts, invitational to
game.
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3C/3D 5+ hearts, 4+ card suit. Forcing to game.
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3H Invitational with 6+ hearts
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3NT Exactly 5 hearts. Choice of games
(4H or 3NT).
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3S/4C/4D Splinters (6+ hearts, singleton or void in the
suit bid, interest in slam)
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4H 6+ hearts, no singleton or void,
mild slam interest
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4NT Exactly 5 hearts. Invitational to
6H or 6NT
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5NT Choice of slames (6H or 6NT)
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2H Jacoby Transfer Bid (promises 5+ spades).
Opener would normally bid 2S, but can superaccept with a maximum and 4-card
spade support. After 2S:
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2NT Exactly 5 spades, invitational to
game.
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3C/3D 5+ spades, 4+ card suit. Forcing to game.
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3H 5+ spades, 5+ hearts. Forcing to
game.
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3S Invitational with 6+ spades
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3NT Exactly 5 spades. Choice of games
(4S or 3NT).
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4C/4D/4H Splinters (6+ spades, singleton or void in the
suit bid, interest in slam)
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4S 6+ spades, no singleton or void,
mild slam interest
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4NT Exactly 5 spades. Invitational to
6S or 6NT
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5NT Choice of slams (6S or 6NT).
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2S Minor Suit Stayman (Usually at least 54 in
the minors, forcing to game)
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Opener would normally bid a 4+ card minor if he had one, but can bid 2NT
with 3343 or 3334 distribution.
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If responder's next bid is 3 of a major, he is promising a singleton
or void in that suit, but not necessarily slam interest
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2NT Minor Suit Transfer (Promises 6+ clubs.
Opener must bid 3C)
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If responder's next bid is 3 of a new suit, he is promising a singleton or
void in that suit, but not necessarily slam interest
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Responder's 3NT rebid is a mild slam try (usually balanced).
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Responder's 4NT rebid is RKCB
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3C Minor Suit Transfer (Promises 6+ diamonds.
Opener must bid 3D)
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If responder's next bid is 3 of a new suit, he is promising a
singleton or void in that suit, but not necessarily slam interest
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Responder's 3NT rebid is a mild slam try (usually balanced).
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Responder's 4NT rebid is RKCB
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3D/3H/3S Singleton or void in the suit bid,
at least 4 cards in the other 3 suits, no 5card major, forcing to game.
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3NT Signoff
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4C Gerber
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4D Texas Transfer (Promises 6+ hearts, opener
must bid 4H)
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New suit rebid by responder is a cuebid.
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4NT rebid by responder is RKCB.
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4H Texas Transfer (Promises 6+ spades, opener
must bid 4S)
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New suit rebid by responder is a cuebid.
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4NT rebid by responder is RKCB.
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4NT Invitational to 6NT
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5NT Invitational to 7NT
After a 2N opening bid
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3C Stayman (promises at least one 4-card major)
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3D No 4-card major
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3H/3S Smolen (forcing to game with 4 of the suit bid
and 5 of the other major)
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4C/4D 5+ card suit. Interest in slam
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4H/4S Signoff bids
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4NT Invitational to 6NT
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3H 4 hearts (could also have 4 spades)
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3S Artificial slam try with
4+ hearts
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3NT Choice of games (4S or 3NT). Promises 4 spades.
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4C/4D 5+ card suit. Interest in slam
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4NT Invitational to 6NT
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3S 4 spades (denies 4 hearts)
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3NT Signoff (promises 4 hearts)
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4C/4D 5+ card suit. Interest in slam.
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4H Artificial slam try with
4+ spades
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4NT Invitational to 6NT
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3D Jacoby Transfer Bid (promises 5+ hearts).
Opener would normally bid 3H, but can superaccept with a maximum and 4-card
heart support. After 3H:
-
3S 5+ hearts, 5+ spades,
interest in slam
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3NT Exactly 5 hearts. Choice of games (4H or 3NT)
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4C/4D 5+ hearts, 4+ cards in suit bid, forcing to game
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4H Mild slam try with 6+ hearts
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4NT Exactly 5 hearts. Invitational to 6H or
6NT
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5NT Choice of slams (6H or 6NT)
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3H Jacoby Transfer Bid (promises 5+ spades).
Opener would normally bid 3S, but can superaccept with a maximum and 4-card
spade support. After 3S:
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3NT Exactly 5 spades. Choice of games (4S or
3NT)
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4C/4D 5+ spades, 4+ cards in suit bid, forcing to game
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4H 5+ spades, 5+ hearts, choice
of games (4H or 4S)
-
4S Mild slam try with 6+
spades
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4NT Exactly 5 spades. Invitational to 6S or
6NT
-
5NT Choice of slams (6S or 6NT)
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3S Minor Suit Stayman (usually at least 54 in the
minors, forcing to game)
-
Opener would normally bid a 4+ card minor if he had one. Otherwise
he would bid 3NT.
-
If responder's next bid is 4 of a major, he is promising a singleton
or void in that suit
-
3NT Signoff
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4C Gerber
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4D Texas Transfer (Promises 6+ hearts, opener must
bid 4H)
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New suit rebid by responder is a cuebid.
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4NT rebid by responder is RKCB.
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4H Texas Transfer (Promises 6+ spades, opener must bid
4S)
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New suit rebid by responder is a cuebid.
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4NT rebid by responder is RKCB.
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4NT Invitational to 6NT
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5NT Invitational to 7NT
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