xxhong

There are just many many logical holes in the program. For example, a very basic one, if you pass a one level opening, it should suggest a hand with less than 19 HCPs. I don't think gib ever has this kind of logic.

1S 2D 2N(6+S, extra value, good 14+) 3H(natural) 3N 4N(inv) 5H(accept, 3 H) 5N(pick a slam) 6H(HJ is important)

This is simply not playable. I don't think any top players play this.

Although 3NT doesn't look very good, I can still live with it. The worst bid is 6C. Facing a 4NT invitation, south has no business to accept it with a misfit minimum.

1H 2C 2D 2S 3C 3H 4N(ERKC in H with S void) 5D(3-0) Now we have a problem.

The robot shouldn't take human opps' bidding too seriously. In a better set up, I think the robot should only take partner's and robot opp's bidding very seriously and shouldn't simulate based purely on human opps' bidding, which is often not reliable at all. Also many human players tend to distort the minor suit openings, 1NT range and other bids to mislead gib and take an advantage. Gib is especially vulnerable to human opps psyche or semi-psyche, because gib never implements any penalty doubles even at 7 level. I once opened 1D with 4 HCP, one Q and two jacks. My gib pushed me to 6NT, and my opps' gib holds SA and DAK and failed to double this 6NT. This makes psyche when white very cheap. If my gib hangs me by pushing me to slams, I still don't suffer a huge loss and only went down quietly 4 tricks. -200 and -800 is a huge difference and makes psyche very very profitable because in those times your psyche works, it works very very well.

To push this board against gib, it is very simple. Gib always assumes an opening to show 12 HCP or more. So you just play S to SQ, then finesse ST. If it lost, you just take D finesse later.

1C p p x p 1D p 2H p 3N p 4H.

Being able to show a void at 4 level or lower is the key to many successful slams. Actually, IMO, it may win you tons' of IMPs if you have this gadget and your opps don't.

For natural system, it's often a good idea to bid a 3 card minor suit not a three card major suit. Early distortion of major holding can be very dangerous and difficult to recover. If 2N is nonforcing, I think the system bid for west's hand has to be 3NT after 2D, showing good 12 to 16 HCPs.

Well, I was talking about the stone age or bronze age acol... At least in Reese' or Crowhurst's book, 2NT is served to be natural I think.

I usually open 1C with this hand. 1C 1H 2S(good hand, 6+C) 3C(fit, gf) 3N 4D(RKC) blabla. If you open 1NT, it may go like this: 1N 2D 2H 2N(gf, waiting, using 2S for invitational hands) 3C(5+C) 4C 4D(RKC) 4N 5D 6H(HKQJ) 7C/7NT

Yes, SAYC players play strong jumpshifts. However, the 2/1 requirement of sayc is considerable stronger than acol. So Acol has more sign off sequences after 2/1 than sayc. Also, ACOL players don't play jacoby 2NT. Therefore, acol players actually jumpshift way more often than sayc players.

This is a penalty double and partner pulled to to 3H, so it shows a weak hand with short C and 3 H (with 4H, short C, usually partner can bid a preemptive 3H if your system allows). Therefore, it's good to pass this 3H because of trump quality concerns. Partner most likely holds something like xxxx Qxx Jxxxx x. If trump is 4-1 or they lead trumps, you will often go down.

Hand 1: 1C 1H 2C 2H (gf, 5+H) 3D(extra) 4D 4S(cue) 4N(cue in H) 5C(cue) 5H(cue HK) 6C(cue CK and even number of KC) 6D (missing one KC) Hand 2: 3N(27-28, upgraded for good C) 4N(invite) 5C(natural) 6C

acol and SEF players play strong jumpshifts way more frequently than SAYC players. Also, many acol players just jump to 4m to show value and slam going raise in 4S in this sequence.

My extra definition is rather low. IMO, if I remove one King and still want to open it at 1 level, I'd call it extra. In your example, I'd open 1H with xx AJxxx A JT9xx, so I just bid 3C.

5+ may not be good enough, because gib itself frequently rebids 1NT with singletons in responder's suit. So a better treatment should be 6+ or at least good 5+. Also, gib should be set to pass NT frequently with a singleton or void in opener's suit.

passing a 12 HCP hand need a lot of good reasons, stiff HQ is not bad enough to pass it IMO. This hand has good controls, good shape and reasonable spades. If partner push you to slams, you usually don't mind to play there either.

Players nowadays frequently upgrade their hands. In my observation, many claim to play 15-17 1NT, but indeed play a 14.5-17 (or even weaker, like 14-16 for some) 1NT. These actions make penalty double more attractive because you may miss game more frequently if you pass with strong balanced hands. Also, against NT range that is weaker than 15-17, IMO, one has to play a penalty double to hold their own.

3D and later bid 4S to show this extreme 7-5 two suiter.

very simple: 2C 2D(gf) 3H(both majors, at least 5-5) 4D(cue, agreeing H, denies C control) 6H.

I would bid like: 1H 2C(gf) 2H(extra, 6+H) 2S(natural) 3H(7+H) 4N(natural invitation, void in H) 6H

2S would be a huge underbid, 4S has an excellent play facing Axxxx Qx xxx Qxx. 2C is also very bad, suppose partner holds the above hand, it's also unclear to invite. Therefore, I probably vote for an overbid of 2H. Those two tens should be useful to play in 3NT when you don't have a 8 card S fit.

This is a simple RKC hand after the transfer. Holding 15 HCP, decent 7 card suit and partner showed CA, there is just no way to play 3NT.