Oren Lidor is considered one of the best bridge teachers in Israel, is the author of 5 bridge books, and teaches bridge to people from all over the world on BBO.
In the system for BBO bidders challenge, 5Cl means 1 or 4 key cards. It seems Lidor plays 03-14... How do we know which is applicable?
Lidor sais "What do you know about partner's hand? They have between 12 and 14 points, a balanced hand and 3 aces, otherwise they can’t have an opening".
I think North could have KQ in spades, KQ in diamonds and one Ace...
I would like to see our host respond to the objections of 7C being far too speculative. When I bid 7C, partner comes down with a 4=3=3=3 hand (anti-percentage). When I bid 6C, partner comes down with a 3=3=2=5 hand (losing in MPs to 6H).
And Shiang is right, the 4NT bid stinks, but to respond to the other half of his comment, since these quizzes are designed for intermediate players, they use NMF instead of the more complex XYZ.
Oh. Two annoying errors in a very good and instructive set.
Small: in the example for 3, d10 should be with our partner, otherwise the game is cold. Win sK, take a ruffing finesse against our dA, return to hand with a trump and discard a spade loser on good diamond.
Big: as people already commented, 7c in 1 are bad. If c10 is with our partner, they require 3-2 break in both clubs and hearts (if hearts are 4-1, heart lead destroys the communication). This is less than 50%. If the partner holds three small under the cA, there is no chance on a heart lead (and if partner also lacks h10, any lead would do). The grand requires at least 56-57% IF we can be sure that either 6 or 7 in the right denomination would be played at all tables. With a good portion (or even majority) of the field playind in hearts, bidding 7c can be profitable with the chances, I guess, over 80%. One last thing: partner will show maximum with the majority of hands containing five clubs, heart fit, and three aces, so he is very likely to have exactly 3334 (other shapes contradict the first two bids).
Not sure I like the bidding on 1. 4nt killed a lot of space and didn't allow for exploration of shape and cue bid of 2nd round controls. 4nt also looks more like quantitative than key card for hearts.
Play xyz what's the rush start by setting trump or bidding 3c it's forcing to 3nt.
Yes very informative again. I found hands 3 and 4 particularly so. In hand 3 I recognised the spade problem,but failed to see the solution was not to blindly take my ace of iamonds while I could. A wake up call I'll try to remember next time Ikm in that dilemma. Hand 4, the power of 4-4 trumps and longer fit side suit for ruffing - will help the penny to drop for me to not choose the long fit as trumps....
7c = 45.9684%. bad slam 🙂 you need cl 3-2 and hearts 3-2 . on heart lead there is no communication to ruff 2nd spade if hearts are 4-1 and if clubs are 4-1 and hearts 3-2 you need also A109x not only A10xx. 6hearts good bridge.
on hand 1, the claim that 7c is cold is nonesense (hyperbole?). Ignoring the possibilities of 5-0 trumps and a heart ruff (Lightner double from W), a 4-1 trump break makes it thin, and the normal trump lead complicates matters. I would estimate that 6c bid and made is 90% (no other slam has play). Bidding a grand needing good breaks all round risks losing 90%+ to gain at most 10%
Assuming the system played here is the system the Bots play, on board 1 1NT does NOT deny 4 spades, it just says balanced 12-14. Nor does the 2 hearts rebid denies 4 spades, showing 3 hearts is mandatory even with 4 spades. Partner having a 4 card club is likely yes, but certainly not guaranteed.
I agree with Adrian. Need to say if 1430 or 3014.
Two things I don't like about hand 1.
In the system for BBO bidders challenge, 5Cl means 1 or 4 key cards. It seems Lidor plays 03-14... How do we know which is applicable?
Lidor sais "What do you know about partner's hand? They have between 12 and 14 points, a balanced hand and 3 aces, otherwise they can’t have an opening".
I think North could have KQ in spades, KQ in diamonds and one Ace...
ty for reply/clarification. My opinion on XYZ is we should teach everyone xyz as it's better than NMF 80/90% of the time.
Supper easy to learn and comes up all the time.
Opener should not bid 1NT with 4333. Therefore, he holds at least four clubs.
I would like to see our host respond to the objections of 7C being far too speculative. When I bid 7C, partner comes down with a 4=3=3=3 hand (anti-percentage). When I bid 6C, partner comes down with a 3=3=2=5 hand (losing in MPs to 6H).
And Shiang is right, the 4NT bid stinks, but to respond to the other half of his comment, since these quizzes are designed for intermediate players, they use NMF instead of the more complex XYZ.
Very Helpful particularly for Beginners of Bridge and even for
Intermediates also.
Sir, I found this Queeze as an Interesting Learning and Skill Improving exercise. I can continue with such more exercises.
Oh. Two annoying errors in a very good and instructive set.
Small: in the example for 3, d10 should be with our partner, otherwise the game is cold. Win sK, take a ruffing finesse against our dA, return to hand with a trump and discard a spade loser on good diamond.
Big: as people already commented, 7c in 1 are bad. If c10 is with our partner, they require 3-2 break in both clubs and hearts (if hearts are 4-1, heart lead destroys the communication). This is less than 50%. If the partner holds three small under the cA, there is no chance on a heart lead (and if partner also lacks h10, any lead would do). The grand requires at least 56-57% IF we can be sure that either 6 or 7 in the right denomination would be played at all tables. With a good portion (or even majority) of the field playind in hearts, bidding 7c can be profitable with the chances, I guess, over 80%. One last thing: partner will show maximum with the majority of hands containing five clubs, heart fit, and three aces, so he is very likely to have exactly 3334 (other shapes contradict the first two bids).
Where do i fiind the answers to the quizes?
20/20, 3 was hard.
Not sure I like the bidding on 1. 4nt killed a lot of space and didn't allow for exploration of shape and cue bid of 2nd round controls. 4nt also looks more like quantitative than key card for hearts.
Play xyz what's the rush start by setting trump or bidding 3c it's forcing to 3nt.
Yes very informative again. I found hands 3 and 4 particularly so. In hand 3 I recognised the spade problem,but failed to see the solution was not to blindly take my ace of iamonds while I could. A wake up call I'll try to remember next time Ikm in that dilemma. Hand 4, the power of 4-4 trumps and longer fit side suit for ruffing - will help the penny to drop for me to not choose the long fit as trumps....
Also not certain there are 4 clubs
Imps?
Matchpoints?
Imps?
Matchpoints?
It would be nice not to have to guess.
Another excellent quiz by Oren. I learn so much from his comments
7c = 45.9684%. bad slam 🙂 you need cl 3-2 and hearts 3-2 . on heart lead there is no communication to ruff 2nd spade if hearts are 4-1 and if clubs are 4-1 and hearts 3-2 you need also A109x not only A10xx. 6hearts good bridge.
In Hand 3, dealer has a singleton in Diamonds so winning a second trick in D (as you analyze) seems not possible as it will be trumped.
on hand 1, the claim that 7c is cold is nonesense (hyperbole?). Ignoring the possibilities of 5-0 trumps and a heart ruff (Lightner double from W), a 4-1 trump break makes it thin, and the normal trump lead complicates matters. I would estimate that 6c bid and made is 90% (no other slam has play). Bidding a grand needing good breaks all round risks losing 90%+ to gain at most 10%
Assuming the system played here is the system the Bots play, on board 1 1NT does NOT deny 4 spades, it just says balanced 12-14. Nor does the 2 hearts rebid denies 4 spades, showing 3 hearts is mandatory even with 4 spades. Partner having a 4 card club is likely yes, but certainly not guaranteed.
To be more precise, for many 1n may be bid on 4333 (or 4324 4234 without hurting the case), which would make the grand in c a little wanting
3014 or 1430? Makes a huge difference.
On hand one, it should be stated 1n excludes 4s. In any case 3c over 2h seems to be a better bid than b-wood
There is communication problem on Hand 1
There is a sound reason why Oren's quizzes are awesome - every problem teaches a concept. An incredibly good teacher!