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5-MAR-06 very hard

 
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Nenthorn



Joined: 13 Nov 2005
Posts: 11
Location: Scotland

PostPosted: Mon Mar 06, 2006 8:55 am    Post subject: 5-MAR-06 very hard Reply with quote

Stuck again. This seemed to be over the hump, but I can't for the life of me see where to go next. Will some kind soul put an end to my misery? What am I missing this time?

080 000 010
920 803 040
003 045 028
002 490 001
039 000 472
140 327 600
200 684 100
000 709 254
090 000 867
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Steve R



Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England

PostPosted: Mon Mar 06, 2006 2:48 pm    Post subject: 5-MAR-06 very hard Reply with quote

One way forward is to chase the 6s.

In b2 and b3 the 6s occupy rows 1 and 2 so that in b1 6 occupies row 3. This means it falls into column 1 or column 2. But the same applies to the 6 in b4. So the 6 in b7 lies in column 3 and there is only one place for it: r8c3.

Steve
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Nenthorn



Joined: 13 Nov 2005
Posts: 11
Location: Scotland

PostPosted: Mon Mar 06, 2006 3:09 pm    Post subject: 5-MAR-06 very hard Reply with quote

Thanks, Steve. You're a good man.
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jupipi



Joined: 13 Feb 2006
Posts: 3
Location: Córdoba.-Spain

PostPosted: Fri Mar 10, 2006 8:45 pm    Post subject: Reply with quote

Steve, in your response to Nenthorn, you say : " But the same applies to the 6 in b 4". Will you explain to me how I do this?. Thanks in advance.
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keith



Joined: 19 Sep 2005
Posts: 3136
Location: near Detroit, Michigan, USA

PostPosted: Fri Mar 10, 2006 9:58 pm    Post subject: Reply with quote

I believe he means:

The 6's in B2 and B3 are not in R3. So, the 6 in B1 is in R3, which means it is not in C3. So, the 6 in C3 must be in R8, if it is not in B1.

Keith
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jupipi



Joined: 13 Feb 2006
Posts: 3
Location: Córdoba.-Spain

PostPosted: Sun Mar 12, 2006 5:50 pm    Post subject: 5-Mar-06 very hard Reply with quote

Thanks, Keith, with your aid I have completed this sudoku.Thanks also to Steve.
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