[plaur]

Lead King of hearts, east follows suit

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Reading an old article(Dansk Bridge, juli 1984) about Oswald Jacoby. It reads: "West led ♥K and when East followed Ozzie claimed on a double squeeze against any distribution. Only six seconds had passed since the lead! Try it yourself." I cant see it. What am I missing?

One failed try: Assume West has ♥A and leads a spade on trick two. I draw trumps, ♦A, ♦K, ruff ♦, run spades. In the four card position I play the last spade. West keeps ♥A so I discard the ♥Q from dummy. Cross to dummy with a low club and leads a club from dummy. Both opponents have followed suit in both minors. West is 1633 or 1642 but I still dont know where the minor Queens are, so dont know whether to drop or finesse clubs.

Four card postion with South on lead. ♣Q and ♦Q both still out, but not known who has which

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[Phil]

In your 4 card ending if West has the high diamond, West has to come down to one club. If East has it he can't keep 2C +1D after the spade is played.

Note: the jC technically isn't needed.

[PhantomSac]

What he's saying is you don't know who guards diamonds so you don't know whether to hook the club or play for the drop in the endgame.

[Kaitlyn S]

Because you don't know the opponents' distribution, you might need the CJ. Ruff the third diamond and come down to:

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When you lead the trump, if East has the high diamond, West needs to keep the heart (so you can discard the HQ) and East needs to keep the diamond, and your last club is good, with the CJ being irrelevant.

However, when West has the high diamond, East isn't squeezed at all. However, West must come down to only one club and East will have all clubs, possibly including the queen. So, lead a club to the CA extracting West's last club, and the CJ is quite relevant now.

[rmnka447]

The squeeze is a compound squeeze. Because the suits with the doubly stopped threats (♦ 10, ♣ J) are divided between the two hands, the compound squeeze will be, by Love's terminology, a type L compound squeeze. Assuming the ♥ A is with West, ♥ Q is the basic threat against West.

If West holds guards in all side suits, then on the 2nd last free suit (♠) winner, West will have to discard a card which removes one of those guards. That's because you are executing a one loser triple squeeze on West when you play the 2nd last free suit winner. Depending on what suit is abandoned, the resultant double squeeze will be either a type R double squeeze or a type B1/C1 double squeeze.

To keep all possibilities open, you can't cash the ♦ winners as you must allow for the execution of either possible double squeeze.

If West only has guards in one suit (♥) or two suits (♥ and a minor), hopefully that will become apparent as you run ♠. Also, with ♥ QJ in dummy, West may be under additional pressure because of the need to retain ♥ Ax to prevent a possible setup of a ♥ trick by ruffing out a stiff ♥ A.

[Phil]

rmnka447, on 2016-October-22, 13:58, said:

The squeeze is a compound squeeze. Because the suits with the doubly stopped threats (♦ 10, ♣ J) are divided between the two hands, the compound squeeze will be, by Love's terminology, a type L compound squeeze. Assuming the ♥ A is with West, ♥ Q is the basic threat against West.

Once we ruff out the diamond it ceases to be a compound. Edit - I see you say that in your 3rd paragraph.

[plaur]

rmnka447, on 2016-October-22, 13:58, said:

The squeeze is a compound squeeze ...

Thank you!
I need the threat of ruffing a heart good(missed that) and keep the diamond entry for that. Because of the heart ruffing threat West must keep two hearts and thus discard a minor suit card. Then, when I ruff a diamond, I will know who guards diamonds (or diamonds are good) and then in the end I will know the club position.

[Stefan_O]

Awesome guy, Oswald.
How do I reach that level?

[nige1]

Agree with Plaur.
IMO the director should normally deny the claim if ♦ are 4-3 or 3-4.
The claim would save time only against trusting defenders.
Suppose LHO switches to a ♦.
Does Jacoby have a sure-trick play at single dummy?
.

[alok c]

This will be the 6card ending
N-NIL-QJ-K10-AX
E-Whatever
S-XX-NIL-X-KJX
W-NIL-AX-QXXX-NIL(or any minor suit combination,what ihave shown is an extreme case)
Play,
1.South Spade, discard a Heart from dummy.West can not discard a Heart.
2&3.Diamond to K & ruff a diamond.
Same play if West has 4 Clubs instead of 4 diamonds.
Club J is important either to take a marked finesse thru' East or to prevent Club 10 if in East's hand to take a trick.

[msjennifer]

What kaitlyn says is correct.If,as is obvious ,the HA is with West then who holds the Diamonds is immaterial.It becomes an automatic double squeeze or a finesse on discovery.

[GrahamJson]

Kaitlyn S, on 2016-October-22, 13:40, said:

Because you don't know the opponents' distribution, you might need the CJ. Ruff the third diamond and come down to:

---

When you lead the trump, if East has the high diamond, West needs to keep the heart (so you can discard the HQ) and East needs to keep the diamond, and your last club is good, with the CJ being irrelevant.

However, when West has the high diamond, East isn't squeezed at all. However, West must come down to only one club and East will have all clubs, possibly including the queen. So, lead a club to the CA extracting West's last club, and the CJ is quite relevant now.

Unless I've missed something this isn't quite correct. You lead the last spade, discarding the hear (assuming west holds on to the ace). However you still don't know who holds the diamond guard. If east then you play clubs from the top and the last is good. If west, you finesse the jack. But it is still a guess.

[Kaitlyn S]

GrahamJson, on 2016-October-23, 08:43, said:

Unless I've missed something this isn't quite correct. You lead the last spade, discarding the hear (assuming west holds on to the ace). However you still don't know who holds the diamond guard. If east then you play clubs from the top and the last is good. If west, you finesse the jack. But it is still a guess.

You are right. Dang, I misplaced 2 hands on here yesterday.

[Lovera]

The possibility suggest on diamond suit (4-3) takes at a compound squeeze after five rounds of trump with Q ♥ unilateral in N and the minors as double threats (Ax/R10x ♦ in N and Ax/RJx ♣ in S). On next of last trump W if discard ♦ after cashing A and K is estabilished a twin entry double sq. whilest if discard ♣ after cashing A and K in club and A in diamond suit is estabilished a balanced double squeeze on last spade.

[wank]

i expect it's something to do with the extended (trump squeeze) menace against west. he needs to keep 2 hearts perforce, not only 1. we'll assume he knows the heart count - east will give it honestly.

[nige1]

rmnka447, on 2016-October-22, 13:58, said:

] Also, with ♥ QJ in dummy, West may be under additional pressure because of the need to retain ♥ Ax to prevent a possible setup of a ♥ trick by ruffing out a stiff ♥ A.

wank, on 2016-October-24, 04:05, said:

i expect it's something to do with the extended (trump squeeze) menace against west. he needs to keep 2 hearts perforce, not only 1. we'll assume he knows the heart cot - east will give it honestly.

mnka447 and wank make an excellent argument but IMO, the director shouldn't allow a claim, at trick one, that depends on defenders assisting declarer with their signals. Without such help, declarer might guess wrong if LHO bares ♥A and RHO keeps an obfuscating singleton ♥.

If declarer is relying on an inferential count, he should make that clear in his initial claim-statement,

[Lovera]

plaur, on 2016-October-22, 10:49, said:

Lead King of hearts, east follows suit

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Second trick: Diamond 8

West hand : ♠ 853 ♥ AK10984 ♦ 8 ♣ Q86 - East hand : ♠ - ♥ 765 ♦ QJ9742 ♣ 10973 (from "BRIDGE A' LA UNE" by Jose' Le Dentu).

[miamijd]

Lovera, on 2016-October-24, 13:34, said:

West hand : ♠ 853 ♥ AK10984 ♦ 8 ♣ Q86 - East hand : ♠ - ♥ 765 ♦ QJ9742 ♣ 10973 (from "BRIDGE A' LA UNE" by Jose' Le Dentu).

Since the problem says "Second trick diamond 8," we can assume that Ozzie didn't claim until the 8d hit the table. After that, it's easy, and the Jack of clubs is indeed immaterial, although it relies on the 8D being honest and sane. If West had either or both diamond honors, he wouldn't lead the 8d at trick 2. So either West has 8742 of diamonds, or East has the D guard. If West has the 8742, the QJ get ruffed out, and the 10 is the 12th trick.

If the QJ don't ruff out, then East has the diamond guard, and there is an easy double squeeze. West must keep H guard; East must keep D guard; no one can keep C guard. Jc could be a small one; same result.

Cheers,
Mike

[nige1]

nige1, on 2016-October-24, 15:48, said:

Thank you, Lovera OK, on that layout, IMO, the director should allow Jacoby's claim.

miamijd, on 2016-October-24, 15:44, said:

Since the problem says "Second trick diamond 8," we can assume that Ozzie didn't claim until the 8d hit the table.

The OP states that Jacoby claimed at trick 1 and does not mention ♦8

[alok c]

OP said "---- against any distribution".It tacitly implies against assumption for opponents play. North is also getting squeezed,if East is protecting ♦ he will simply reduce his holding as per North's discard .