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pmarmite
Joined: 24 Jun 2006
Posts: 1
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 Posted: Sat Jun 24, 2006 1:40 pm Post subject: Help w/ June 24 |
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So far I have:
9-- -15 463
-41 --3 895
35- 94- 172
--3 5-- 914
417 369 528
5-9 4-1 637
-95 -34 -81
1-- -5- 349
1-- -5- 349
The hint says put 2 in r4c1.
Why?
Thanks, phil |
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David Bryant
Joined: 29 Jul 2005
Posts: 559
Location: Denver, Colorado
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| Posted: Sat Jun 24, 2006 5:09 pm Post subject: Double X-Wing |
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Hi, Phil!
I think you've repeated row 8 twice in your post above. Here's what the puzzle looked like when I arrived at the same crunch point.
| Code: | 9-- -15 463
-41 --3 895
35- 94- 172
--3 5-- 914
417 369 528
5-9 4-1 637
-95 -34 -81
1-- -5- 349
834 19- -56 |
From here I had to identify two successive X-Wings to solve the puzzle.
1. There are only two ways to fit a "7" in row 1. Similarly, there are only two ways to fit a "7" in row 8. So you can use an X-Wing on "7"s (r1c24 & r8c24) to eliminate the possibility of a "7" in r2c4 & in r7c4.
After making these eliminations you will find the hidden pair {2, 6} lying in r2c4 & r7c4, implying that the only possibilities at r1c4 & r8c4 are {7, 8}.
2. Now you can identify a second X-Wing, on the digit "2", in r1c23 and r8c23. This X-Wing pattern lets you eliminate the possibility of a "2" at r4c2 & r6c2, leading to the conclusion that r4c1 = 2. dcb |
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Steve R
Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England
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| Posted: Sat Jun 24, 2006 5:29 pm Post subject: |
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I think one flight will do on a Saturday.
Is there not an X-wing for 6 based on rows 2 and 7 which eliminates 6 from r4c1, leaving 2 as the only admissible candidate?
Steve |
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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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| Posted: Mon Jun 26, 2006 2:22 pm Post subject: Daily Sudoku: Sat24-Jun-2006 |
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Steve R
I am not very conversant with THE X-Wing
Why did you choose 6 as a base on rows 2 & 7 why not 2? Because the position was like this:-
267 267
267 267
Thus leaving 6 as the only admissible candidate in r4c1? |
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TKiel
Joined: 22 Feb 2006
Posts: 292
Location: Kalamazoo, MI
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| Posted: Mon Jun 26, 2006 9:20 pm Post subject: |
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| An x-wing can only have two possibilities for the particular number in either each row or in each column. 2's appear three times in each row and 3 times in one column & 4 times in the other. |
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