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DT 12th April

 
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Korky



Joined: 29 Mar 2006
Posts: 13
Location: Sheffield, UK

PostPosted: Wed Apr 12, 2006 2:43 pm    Post subject: DT 12th April Reply with quote

Can anyone help with this
Code:

x58 xx4 x92
xx9 2x8 x45
x42 59x 183

xx7 452 x16
x24 xx1 x5x
5x1 x8x 42x

283 749 561
915 863 274
476 125 x3x
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David Bryant



Joined: 29 Jul 2005
Posts: 559
Location: Denver, Colorado

PostPosted: Wed Apr 12, 2006 3:31 pm    Post subject: This is a "fork" position. Reply with quote

Hi, Korky!

The short answer is that you can eliminate the possibility of a "6" at r3c1. Here's why.

-- There are only two places for a "6" in column 2, at r2c2 and r6c2.

-- There are only two places for a "6" in column 6, at r3c6 and r6c6.

-- If r2c2 = 6, then clearly r3c1 <> 6.

-- But if r2c2 <> 6, then r6c2 = 6, r6c6 <> 6, r3c6 = 6, and r3c1 <> 6.

I think that's enough to solve the puzzle. dcb
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ravel
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PostPosted: Wed Apr 12, 2006 3:58 pm    Post subject: Reply with quote

For doing it without a forcing chain this link might help you. The 2 strong links to eliminate 6 in r3c1 here are either r5c1-r6c2 and r6c6-r3c6 or (as David pointed out) r2c2-r6c2 and r6c6-r3c6
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Korky



Joined: 29 Mar 2006
Posts: 13
Location: Sheffield, UK

PostPosted: Wed Apr 12, 2006 6:37 pm    Post subject: Reply with quote

Thanks guys. The "fork position" is a new one on me. I'll try to spot it myself next time.
Your help much appreciated.
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