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Help Please

 
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PostPosted: Mon May 22, 2006 3:49 am    Post subject: Help Please Reply with quote

I would appreciate any help with this one please. When I put this into DRAW and click HINT it gives r9c6 = 9. Why is this so?
(Brisbane Courier Mail 9/5/06)

xxx xxx 7xx
976 xx8 2xx
x4x 72x xx3

x3x 49x xxx
1xx x8x xx2
xxx 152 37x

7xx x61 x2x
xxx 87x 9x6
xx8 2xx xx7
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ravel



Joined: 21 Apr 2006
Posts: 536

PostPosted: Mon May 22, 2006 7:43 am    Post subject: Reply with quote

There is a naked pair 59 in column 2, so r9c2 cannot be 9.
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Joined: 07 Dec 2005
Posts: 29
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PostPosted: Mon May 22, 2006 7:52 am    Post subject: Reply with quote

Hallo nuages

A longer explanation (ravel was quicker):

The 6 in col9 forces row6 to have its 6 in box4.

Thus there won't be a 6 in the rest of box4.
This includes r5c2, leaving it with only {5,9} as possibilities.

Then because r8c2 is also constrained to {5,9},
no other cells in col2 will be 5 or 9.

This affects row9, leaving no choice as to where a 9 can go.
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PostPosted: Mon May 22, 2006 10:29 am    Post subject: Help Please Reply with quote

Dear Ravel and dotdot
Thanks very much. Its obvious now you have pointed it out!

Regards
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