Help w/ published puzzle

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Help w/ published puzzle

Postby jandenny » Fri May 15, 2009 3:38 pm

I am stuck please tell me the next step and the logic behind it.
Thanks
Jan

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

jandenny
 
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Postby Pat » Sat May 16, 2009 12:34 pm

hi jandenny

you probably need a "forcing chain"
    e.g.

    if r2c2 = 9 then r7c7 = 9, r7c4 = 5, r2c4 = 8, r2c2 = 2

    -- the contradiction proves that r2c2 not 9
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