## BUG + 1 Not working

Advanced methods and approaches for solving Sudoku puzzles

### BUG + 1 Not working

Hi

I have this puzzle that starts as:
Code: Select all
`1 . 9|. . .|. . .4 . .|1 . .|5 . .. . .|6 . .|3 7 .-----------------5 2 .|. 4 .|8 . .. . .|5 . 1|. . .. . 7|. 8 .|. 5 2-----------------. 1 4|. . 8|. . .. . 6|. . 7|. . 3. . .|. . .|7 . 4`

After working on it for a while I get to a point where there seem to be 3 BUG+1 situations at blocks 5, 6 and 9. Aren't these BUG's? Because if I fill the cell with the third digit (the one that is in the cell with 3 pencilmarks), I get to and error. So could someone please explain if I am missinterpreting this BUG thing? thanks. Here's the puzzle with the mentioned bugs:
Code: Select all
`1    7    9   |8    35   35  |24   24   64    6    3   |1    7    2   |5    9    828   58   25  |6    9    4   |3    7    1---------------------------------------------5    2    1   |7    4    36  |8    36   9369  349  8   |5    2    1   |46   346  7369  349  7   |39   8    369 |1    5    2---------------------------------------------7    1    4   |239  36   8   |269  26   5289  589  6   |4    15   7   |29   18   32389 3589 25  |239  1356 3569|7    18   4`
JeJ

Posts: 76
Joined: 06 January 2011

### Re: BUG + 1 Not working

daj95376
2014 Supporter

Posts: 2624
Joined: 15 May 2006

### Re: BUG + 1 Not working

daj95376 wrote:http://www.sudopedia.org/wiki/Bivalue_Universal_Grave

Exactly from there I took the explanation about BUG+1. the example shows a situation just like mine (or at least that Is what I think). In the example, the cells have the numbers 5,9 ; 579 and 79 and in my example I have:

On Block 5: 3,6 ; 3,9 and 3,6,9

On block 6: 3,6 ; 4,6 and 3,4,6

And on block 9: 2,6,9 ; 2,6 and 2,9

Are these situations mere triplets and not real bug+1 situations?
JeJ

Posts: 76
Joined: 06 January 2011

### Re: BUG + 1 Not working

The very first sentence of that sudopedia link is ...

"A Bivalue Universal Grave or BUG+0 is a state of the grid in which every unsolved cell has 2 candidates ..."

That's involves all 81 cells of the grid, not just the 9 cells of one 3x3 box at a time.

[edit: "BUG+0" was "BUG"]
Last edited by ronk on Tue Jan 18, 2011 8:57 pm, edited 1 time in total.
ronk
2012 Supporter

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Location: Southeastern USA

### Re: BUG + 1 Not working

Then there is something that I don't understand. If A Bivalue Universal Grave or BUG is a state of the grid in which every unsolved cell has 2 candidates, how come the example shows 3 candidates at r1c5?
JeJ

Posts: 76
Joined: 06 January 2011

### Re: BUG + 1 Not working

JeJ wrote:Then there is something that I don't understand. If A Bivalue Universal Grave or BUG is a state of the grid in which every unsolved cell has 2 candidates, how come the example shows 3 candidates at r1c5?

The example is of a BUG+1, meaning 1 cell has more than 2 candidates.
ronk
2012 Supporter

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

### Re: BUG + 1 Not working

[quote="JeJ"]Hi

I have this puzzle that starts as:
Code: Select all
`1 . 9|. . .|. . .4 . .|1 . .|5 . .. . .|6 . .|3 7 .-----------------5 2 .|. 4 .|8 . .. . .|5 . 1|. . .. . 7|. 8 .|. 5 2-----------------. 1 4|. . 8|. . .. . 6|. . 7|. . 3. . .|. . .|7 . 4`

Singles, Pairs, and Confined are sufficient methods for solving this particular puzzle.

Solution:
Code: Select all
`179|853|426463|172|598285|694|371-----------521|746|839398|521|647647|389|152-----------714|238|965956|417|283832|965|714`
andyistic

Posts: 1
Joined: 23 January 2011

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

Singles, Pairs, and Confined are sufficient methods for solving this particular puzzle.

yes, a nice puzzle --
after "hidden singles", combine 2 moves to solve the next cell --
Â·:Â· spoiler Â·:Â· wrote:Â·:Â·
• b5 6: in c6
• in b9, "hidden" duo {1,8}
combine --> r9 6
Â·:Â·

Pat

Posts: 3701
Joined: 18 July 2005