[cencio]

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lead J♠

[johnu]

What book or article was this very nice safety play problem taken from?

[cencio]

amici del bridge on line

johnu, on 2018-September-05, 16:21, said:

What book or article was this very nice safety play problem taken from?

It is from an italian web site. Amici del bridge on line
My link

[Cyberyeti]

Is this actually meant as a single dummy or double dummy problem ?

[johnu]

Cyberyeti, on 2018-September-06, 06:09, said:

Is this actually meant as a single dummy or double dummy problem ?

This is a textbook quality single dummy problem.

[Cyberyeti]

johnu, on 2018-September-06, 15:50, said:

This is a textbook quality single dummy problem.

OK, I see it now, was always obvious double dummy, but when people show 4 hands, you sometimes assume that's what's intended.

[johnu]

Cyberyeti, on 2018-September-06, 16:51, said:

OK, I see it now, was always obvious double dummy, but when people show 4 hands, you sometimes assume that's what's intended.

Double dummy might be something like West having all 5 clubs and short diamonds with ♦Q.

Spoiler

You have 10 tricks in top cards, and the most likely source of 2 more tricks is in clubs with your 5-3 fit. Look at clubs and you should see a standard safety play in clubs.

Win ♠K, cash top club, then cross to dummy with spade to lead club 8/9. If East shows out or covers, win other top club and lead a club to guarantee 4 club tricks (plus 3 spades, 3 hearts, 2 diamonds = 12 tricks). If East plays low, finesse the 8/9. If it loses, you also have 4 club tricks.

If the 8/9 wins and West shows out, you have 3 club winners and no losers yet, but not enough entries to set up 5th club. You need 3 diamond tricks to make the contract.

Back to diamonds (which you should have already looked at) and it is another textbook safety play for 3 tricks. Cash the ♦A and lead to the ♦K9x planning to finesse the 9 if West plays low, or high if West play Q or 10 or shows out.

Nothing about this problem seems like a double dummy problem to me.

[Cyberyeti]

johnu, on 2018-September-06, 18:08, said:

Double dummy might be something like West having all 5 clubs and short diamonds with ♦Q.

Spoiler

You have 10 tricks in top cards, and the most likely source of 2 more tricks is in clubs with your 5-3 fit. Look at clubs and you should see a standard safety play in clubs.

Win ♠K, cash top club, then cross to dummy with spade to lead club 8/9. If East shows out or covers, win other top club and lead a club to guarantee 4 club tricks (plus 3 spades, 3 hearts, 2 diamonds = 12 tricks). If East plays low, finesse the 8/9. If it loses, you also have 4 club tricks.

If the 8/9 wins and West shows out, you have 3 club winners and no losers yet, but not enough entries to set up 5th club. You need 3 diamond tricks to make the contract.

Back to diamonds (which you should have already looked at) and it is another textbook safety play for 3 tricks. Cash the ♦A and lead to the ♦K9x planning to finesse the 9 if West plays low, or high if West play Q or 10 or shows out.

Nothing about this problem seems like a double dummy problem to me.

Only the fact that 4 hands were shown not 2.

And yes that was the solution I got.