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Puzzle #77 from top1465

 
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daj95376

Joined: 05 Feb 2006
Posts: 349
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PostPosted: Sat May 13, 2006 4:24 pm    Post subject: Puzzle #77 from top1465 Reply with quote

This is reputedly the most difficult puzzle. I certainly wouldn't argue otherwise. It's received a lot of discussion ... particularly in the Sudoku Players' Forum -- of which I'm not a member. So, I'd like to post my solution here if that's okay. (I'm sorry if the notation isn't perfect.)

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

24 Givens

R9C8    =  3     Hidden Single
    B9  =  4     Locked Candidate (1)
r1c3    <> 5     SCE_A (3)
r4c6    <> 9     SCE_A (3)
r5c4    <> 4     SCE_A (3)
r6c5    <> 8     SCE_A (3)
r2c7    =  5     SCE_A (3)

55 additional Naked/Hidden Singles; and 2 additional Locked Candidates (1 & 2)

Solution:  798635421126974583453218679972586314564123897381497256617352948835749162249861735


updated results


Last edited by daj95376 on Sun May 14, 2006 1:24 am; edited 1 time in total
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Ruud
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Joined: 17 Sep 2005
Posts: 708
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Location: Netherlands

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PostPosted: Sat May 13, 2006 5:52 pm    Post subject: Reply with quote

Hi

Can you explain what SCE_A and SCE_B are?

cheers, Ruud.
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