## chicago suntimes -- medium

Post the puzzle or solving technique that's causing you trouble and someone will help

### chicago suntimes -- medium

whats my next move and why

chicago suntimes
medium

xx895x42x
xxx81xx5x
x5624xx8x
6x51x4x3x
xxx6x5xxx
x1x3x9xx5
3915682xx
x8x4315xx
564792318

somebody said to check 9 in box 4 but i see 2 possiblities
i always thought you never guess when playing
silveraider2

Posts: 2
Joined: 06 April 2008

### Re: whats my next move and why

silveraider2 wrote:"...somebody said to check 9 in box 4 but i see 2 possiblities
i always thought you never guess when playing"

Hi silveraider2,

Code: Select all
` *--------------------------------------------------------------------* | 17     37     8      | 9      5      367    | 4      2      1367   | | 2479   2347   2379   | 8      1      367    | 679    5      3679   | | 179    5      6      | 2      4      37     | 179    8      1379   | |----------------------+----------------------+----------------------| | 6      27     5      | 1      278    4      | 789    3      279    | | 24789  2347   2379   | 6      278    5      | 1789   479    12479  | | 2478   1      27     | 3      278    9      | 678    467    5      | |----------------------+----------------------+----------------------| | 3      9      1      | 5      6      8      | 2      47     47     | | 27     8      27     | 4      3      1      | 5      679    679    | | 5      6      4      | 7      9      2      | 3      1      8      | *--------------------------------------------------------------------*`

Within box4 (the middle left 3X3 box) the two candidate 9's only appear in row5 (r5). This "locks" the 9's within this box and therefore any other 9's in this row and outside this box can be excluded. You can now exclude the three 9's from r5 columns 7,8 and 9. This now leaves a "naked pair" [47] in c8 enabling all other 4's and 7's in c8 to be excluded which now solves cell r6c8.

Click on the following links which provide many basic solving techniques:

http://www.angusj.com/sudoku/hints.php
http://www.scanraid.com/BasicStrategies.htm

Cec
Cec

Posts: 1039
Joined: 16 June 2005

### Re: whats my next move and why

silveraider2, you already posted this puzzle in "Help with particular puzzles". Please direct all further requests to that thread.

silveraider2 wrote:chicago suntimes
medium

xx895x42x
xxx81xx5x
x5624xx8x
6x51x4x3x
xxx6x5xxx
x1x3x9xx5
3915682xx
x8x4315xx
564792318

somebody said to check 9 in box 4 but i see 2 possiblities
i always thought you never guess when playing

Somebody also gave you a link to a website, that describes the necessary technique in detail. Have you read that already?

On a sidenote: Two other people gave you links to descriptions, how you could post your puzzles in a user friendly way. It seems you have not read any of those links either...
hobiwan
2012 Supporter

Posts: 321
Joined: 16 January 2008
Location: Klagenfurt

silveraider2 wrote:
Chicago Suntimes

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

somebody said to check 9 in box 4 but i see 2 possiblities

i always thought you never guess when playing

hi silveraider2

indeed in the earlier Topic, hobiwan advised you --
-- and if that wasn't clear, you should've followed the link to the SuDoPedia -- also, i do notice that Cec has already added a detailed explanation, which however involves "pencilmarks" -- personally i'd like to do this without "pencilmarks" so here goes --
look in box 4 --
the 9 for this box
must be in row 5

so, exclude 9 in row 5 outside of this box !

now in column 8, there's only one place for the 9
( not in row 5 )

to everyone else:
the original post was indeed in another Topic, where silveraider2 was advised that a question concerning a published puzzle should go in the Pappocom section ( or in the non-Pappocom section, as appropriate ) -- this advice follows the rules set forth in the sticky -- please don't blame silveraider2 for following the sticky and re-posting here ( though it should've gone in the Pappocom section )

Pat

Posts: 3551
Joined: 18 July 2005

Pat wrote:... a published puzzle should go in the Pappocom section ( or in the non-Pappocom section, as appropriate ) -- this advice follows the rules set forth in the sticky -- please don't blame silveraider2 for following the sticky and re-posting here ( though it should've gone in the Pappocom section )[/list]

Thiings change. Pappocom is no longer associated with this site, so I see no reason anyone should care about making such distinctions.
Moderator has now moved this to the Pappocom section
ronk
2012 Supporter

Posts: 4764
Joined: 02 November 2005
Location: Southeastern USA