Stuck on an old Times puzzle

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Stuck on an old Times puzzle

Postby brianp » Wed Nov 09, 2005 4:06 pm

Can't remember where this one came from. Probably the Times. I've been working on it for ages. I've re-started three times. I've given it to a friend and she solved it by making a guess.

Original grid
1,,2,7,,9
,9,,4,,7,
,,,8,9,,,
,2,,9,,5,
,,9,,,2,,
,3,,7,,4,
,,,1,4,,,
,4,,3,,8,
8,,9,6,,7

Then I got as far as this before getting stuck. I was quite pleased to find block 8 solved so quickly, but then it all ground to a halt

1,42,7,,9
,9,,4,,7,
,,,8,9,,4
,2,,9,75,
,,9,,,2,,
,3,,7294,
,,,184,9,
94,735,8,
8,,9264,7

Any hints or tips please?
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Postby simes » Wed Nov 09, 2005 5:12 pm

I guess you're stuck at the XWing? It's rows 5 and 9, columns 2 and 8 for 1.

S
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Postby MCC » Wed Nov 09, 2005 5:41 pm

simes, I don't see a x-wing in 1's at those positions.

Row 5 has five cells with 1 as a candidate.
Row 9 has three cells with 1 as a candidate.
Column 2 has two cells with 1 as a candidate.
Column 8 has three cells with 1 as a candidate.

So if you use rows or columns you cannot form a x-wing.
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Postby PaulIQ164 » Wed Nov 09, 2005 5:51 pm

And if it's a regular weekday/Saturday puzzle, you shouldn't need an X-Wing.
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Postby MCC » Wed Nov 09, 2005 6:00 pm

Ok simes, I see where you got the x-wing, but first of all you have to place the 2 in r3c8, it's the only place for a 2 in column 8.

That leaves two 1's in columns 2 and in 8.

You can therefore eliminate several 1's from rows 5 and 9.
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Postby simes » Wed Nov 09, 2005 7:38 pm

PaulIQ164 wrote:And if it's a regular weekday/Saturday puzzle, you shouldn't need an X-Wing.
but we don't know where it came from with any certainty, all we have is a "probably."

So how did you solve it?

S
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Postby PaulIQ164 » Wed Nov 09, 2005 7:46 pm

Well, I didn't. And in fact, the Susser agrees you need an X-Wing. So I guess it is a Sunday Times puzzle. I thought I could check by inputting the first five digits in the solutions page, and seeing which of the papers I had to select for it to work, but apparently you can select either the Times or the Sunday Times regardless of which paper you're entering a puzzle from.
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Postby simes » Wed Nov 09, 2005 8:11 pm

PaulIQ164 wrote:Well, I didn't.

Never let a little ignorance get in the way eh?:D
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Postby brianp » Wed Nov 09, 2005 11:22 pm

Thanks for all the comments.
Having got back home and dug out my previous attempts, I see that one of them (the first one) already sports a 2 in r3c8, which ties up. I never thought of a transverse x-wing, but it's obvious they must exist as one could rotate the puzzle through 90 degrees.
Right then. Onwards from here.
Incidentally, I think it most likely to be a Sunday Times puzzle, probably late August or early September.
Thanks again
Brianp
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re: The Sunday Times #11 (2005.Oct.9)

Postby Pat » Thu Nov 10, 2005 12:34 pm

PaulIQ164 wrote:the Susser agrees you need an X-Wing.

So I guess it is a Sunday Times puzzle.


The Sunday Times #11 (2005.Oct.9)

- Pat
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