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may12, and May 13

 
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George Woods



Joined: 28 Mar 2006
Posts: 234
Location: Dorset UK

PostPosted: Sat May 13, 2006 12:16 pm    Post subject: may12, and May 13 Reply with quote

Am I getting senile or are the puzzles just getting harder. On May 12 (Hard) I could do it only by seeing that one 8 in box6 fails i.e. wrong one "solves box 6 but then box3 fails on pressures from "45s".

Now on May 13 I find that I have to postulate in box 3 If this is not a 5 than Box 6 is in trouble hence must be a 5 here.

Are these moves logical? or have I missed a more usual simple logic?
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Huw Llewellyn
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PostPosted: Sat May 13, 2006 1:14 pm    Post subject: May 12 and 13 Reply with quote

I agree with you George, these aredefinitely getting harder. Did the very hard but now not sure how having solved it. Absolutely stuck on 12th May.
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samgj
Site Admin


Joined: 17 Jul 2005
Posts: 106
Location: Cambridge

PostPosted: Sat May 13, 2006 2:56 pm    Post subject: Re: may12, and May 13 Reply with quote

George Woods wrote:
Am I getting senile or are the puzzles just getting harder.


I hope that things are getting a little harder. At least, I'm tinkering with the definitions of hard and v hard to try and ensure that the v hards can't be knocked off without breaking sweat.

Quote:
Are these moves logical? or have I missed a more usual simple logic?


Other than adding the possibility of xwings, this is all tweaks rather than major reworks, so your normal arsenal should get through.

Sam
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George Woods



Joined: 28 Mar 2006
Posts: 234
Location: Dorset UK

PostPosted: Sat May 13, 2006 3:14 pm    Post subject: Re: May 12 and 13 Reply with quote

[img]
Quote:
Absolutely stuck on 12th May
[/img]

I've given you a key move for 12th if you fancy revisiting it![/quote]
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Huw Llewellyn
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PostPosted: Sun May 14, 2006 4:49 am    Post subject: May 12th:Hard Reply with quote

George

Found the unique pairs in this one at long last. Got to go, I'm way behind with the painting etc!!
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Charles



Joined: 31 Mar 2006
Posts: 8
Location: Lawton, Oklahoma, USA

PostPosted: Sun May 14, 2006 9:23 pm    Post subject: Re: may12, and May 13 Reply with quote

George Woods wrote:
Am I getting senile or are the puzzles just getting harder. On May 12 (Hard) I could do it only by seeing that one 8 in box6 fails i.e. wrong one "solves box 6 but then box3 fails on pressures from "45s".

Now on May 13 I find that I have to postulate in box 3 If this is not a 5 than Box 6 is in trouble hence must be a 5 here.

Are these moves logical? or have I missed a more usual simple logic?
Quote:


George: Looking back on notes from May 13 I found my comments.
1). Naked (3,4,5) in Row 4, Block 6.
2.) Five is constrained to Row 9, Block 7.
3.) (7,9) Pair at R7C2 and R7C4.
Apparently I was able to solve completely from here.
I hope that helps. Charles
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George Woods



Joined: 28 Mar 2006
Posts: 234
Location: Dorset UK

PostPosted: Mon May 15, 2006 7:52 am    Post subject: Reply with quote

Charles

Thanks

Mind you I think your second move should be 1s constrained to row 8 block 7 since this gives the 79 in block 7 allowing naked pair and staightforward from there!

Incidentally the mechanism for constraining the 1s might be classed as an X wing in 1s in boxes 8 and 9 - but maybe classifying it thus might be just "showing off"!
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Guest






PostPosted: Mon May 15, 2006 10:25 am    Post subject: Reply with quote

I am afraid these are getting too hard for me, I don't have the time available
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eddieg



Joined: 12 Jan 2006
Posts: 47
Location: San Diego, CA USA

PostPosted: Mon May 15, 2006 8:17 pm    Post subject: Reply with quote

I could not solve May 12 Hard puzzle until I just tried the "Trial and Error" method on the 8's in Box 6 has described somewhat above. I do not like finding a solution based on this methodology, but found no possible other solution. Thanks for the clue above, or I would have never revisited and solved this puzzle.
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ravel



Joined: 21 Apr 2006
Posts: 536

PostPosted: Tue May 16, 2006 12:33 pm    Post subject: Re: may12, and May 13 Reply with quote

Charles wrote:

1). Naked (3,4,5) in Row 4, Block 6.
2.) Five is constrained to Row 9, Block 7.
3.) (7,9) Pair at R7C2 and R7C4.

There are many ways to skin a sudoku Smile This is the order i made the May 13:
Code:
hidden singles: r8c6=6, r4c6=8, r7c1=8,r2c9=8
hidden pair 49 in r1c89
naked single: r6c2=4
naked pair 26 in r12c1
hidden single 2 in r4c2, 6 in r6c3
line/box: 1 in r4c4
hidden pair 27 in r35c9 (r1c9=49)
box/box: (r1c79=49:) 5 in r1c46, not in r3c6 -> (r3c9=27) 5 in r3c8
3 in r3c5
box/line: 5 in r7c7
5 in r4c9
box/line: r3c3=8

So you just have to denote (or keep in mind) 3 pairs.
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TKiel



Joined: 22 Feb 2006
Posts: 292
Location: Kalamazoo, MI

PostPosted: Thu May 18, 2006 12:29 am    Post subject: Reply with quote

I'm pretty sure I did this puzzle but all this talk about it has made me curious. It doesn't seem to be available in the archives, which don't go past May 6. Can anybody post it?
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ravel



Joined: 21 Apr 2006
Posts: 536

PostPosted: Thu May 18, 2006 7:34 am    Post subject: Reply with quote

It is there:
http://www.dailysudoku.co.uk/sudoku/archive/2006/05/2006-05-13.shtml

Code:
---------------------
. 3 . | . . . | . 1 .
. 5 4 | . 9 1 | . . .
9 . . | 4 . . |  6. .
---------------------
7 . 9 | . 6 . | . . .
. 8 . | . . . | . 6 .
. . . | . 2 . | 8 . 1
---------------------
. . 2 | . . 3 | . . 6
. . . | 8  5. | 7 2 .
. 6 . | . . . | . 8 .
---------------------
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