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sudoku Sun 20 August 06 very hard

 
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TPM



Joined: 13 Jun 2006
Posts: 4
Location: Gauteng, South Africa

PostPosted: Wed Aug 23, 2006 3:56 pm    Post subject: sudoku Sun 20 August 06 very hard Reply with quote

Rolling Eyes sudoku Sun 20 August 06 very hard. after filling in all the pencil marks, had to ask for a hint and came up with a 3 in r3c2. At this point I have {3,5} in this position. can someone shed some light.

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George Woods



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

PostPosted: Wed Aug 23, 2006 8:10 pm    Post subject: Reply with quote

I hope I have got it correct from memory. look at box4 col1 and with 5 constrained to row 5 there are a pair of 34.in col1 so this allows you to see r3c2 as 3 since r3c1 cannot be 3!
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Golfgal



Joined: 31 Jul 2006
Posts: 7

PostPosted: Thu Aug 24, 2006 12:20 pm    Post subject: 8/20 Reply with quote

Need further explanation why 3 in c2r3

Choices for 3 are in row 3
235 35 25 69 69 48 48 7 1

row 4:

34 368 7 459 459 2 35 1 3458

row 5

245 58 9 3 1 6 48 28 7

Row 6

234 1 26 8 457 57 9 26 345
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ravel



Joined: 21 Apr 2006
Posts: 536

PostPosted: Thu Aug 24, 2006 2:11 pm    Post subject: Reply with quote

There is a naked pair 26 in row 6. Eliminate the 2 from r6c1 and you get the pair 34 in column 1, which eliminates the 3 from r4c2.
In column 2 then only the 3 in r3c2 is left.
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Golfgal



Joined: 31 Jul 2006
Posts: 7

PostPosted: Thu Aug 24, 2006 2:45 pm    Post subject: Reply with quote

Thank you................I must be blind
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