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TPM
Joined: 13 Jun 2006
Posts: 4
Location: Gauteng, South Africa
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 Posted: Wed Aug 23, 2006 3:56 pm Post subject: sudoku Sun 20 August 06 very hard |
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 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: 304
Location: Dorset UK
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| Posted: Wed Aug 23, 2006 8:10 pm Post subject: |
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| 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
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| Posted: Thu Aug 24, 2006 12:20 pm Post subject: 8/20 |
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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
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| Posted: Thu Aug 24, 2006 2:11 pm Post subject: |
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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
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| Posted: Thu Aug 24, 2006 2:45 pm Post subject: |
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| Thank you................I must be blind |
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