23 TRICK SWING PUZZLE

[PFormaini]

Cayuga is back!

 

So if I am south, I make 13 tricks on one layout, but switching a card my opponents make 1 trick, how many tricks were swung? 1, 2, or 14? Gwnn what's that math problem website again?

Gwnn:

 

No. In layout 1, N-S are cold for 13 tricks with SPADES as trump against any lead or defense. After switching the 1 card between N and W, (the other 50 cards remaining the same). E-W can now take the first 10 tricks with SPADES as trump.

 

Not sure how much clearer the instructions can be made without resorting to hand puppets.

[TimG]

That is a 23 trick swing from N-S tp E-W - all after a simple exchange of a single card from N to W.

Leaving north with 12 cards and west with 14? Or are you proposing that two cards move?

[Cyberyeti]

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7♠ makes trivially on any defence.

 

Now swap N's ace of trumps with W's ♥10.

 

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A heart lead overtaken and 3 rounds of spades would appear to hold declarer to 2 tricks.

 

The hint makes this more difficult

[dellache]

um sorry for nitpicking but looks like it's just a 10 trick swing. who is declarer?

No.

 

It is a 23 trick swing.

 

In case 1 - N-S take all 13 tricks.

 

In case 2 - E-W take 10 tricks.

 

That is a 23 trick swing from N-S tp E-W - all after a simple exchange of a single card from N to W.

What you suggest is not a 23 trick(s) swing. This is actually a 3 tricks swing. This is so obvious that I don't understand why you won't agree with me.

 

Let me paraphrase what you say :

 

In case 1 - E-W take 0 trick.

In case 2 - N-S take 3 tricks.

 

0 + 3 = 3 (I'm not talking about differences but about total tricks ? ok ?)

That is a 3 trick swing from E-W to N-S all after a simple exchange of a single card from W to N :lol: .

 

Moreover, I don't understand why you put the limit at 3 tricks for NS, when it's so obvious to find a case for going from 13 to **2** :

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South makes 13 tricks on any lead with Spades as trump.

Exchange ♠Ace and ♥5, and the defence now makes 11 tricks.

(is that a 24 tricks or a 2 tricks swing ? Ouch, I've lost focus again...).

 

But real puzzle lovers will of course see a case for a 25 tricks swing.

:ph34r: :lol: :ph34r: :angry: :ph34r: