The New Sudoku Players' Forum

[jgraves]

*---*---*---*---*---*---*---*---*---*
| 5 | 7 | | | 9 | | 1 | | 3 |
*---*---*---*---*---*---*---*---*---*
| 3 | 2 | | 8 | 1 | | | 5 | 9 |
*---*---*---*---*---*---*---*---*---*
| 9 | 1 | | 5 | | | 6 | | |
*---*---*---*---*---*---*---*---*---*
| 2 | | | | 5 | | 3 | 6 | 4 |
*---*---*---*---*---*---*---*---*---*
| | 4 | 5 | | | | 8 | 9 | 2 |
*---*---*---*---*---*---*---*---*---*
| 6 | | 3 | | 2 | | 5 | 7 | 1 |
*---*---*---*---*---*---*---*---*---*
| | 6 | 2 | | 8 | 1 | 9 | 3 | 5 |
*---*---*---*---*---*---*---*---*---*
| | 5 | | 3 | 6 | 9 | 2 | | |
*---*---*---*---*---*---*---*---*---*
| 8 | 3 | 9 | 2 | | 5 | | 1 | 6 |
*---*---*---*---*---*---*---*---*---*


I can't find the next step. My help programs don't seem to know, but brute force methods work.

Any advice would be great.

Thanks.

-John

[Ruud]

There is an XY-Wing in (*) r3c9, with pincers (#) in r2c7 & r3c3
{XYZ} = {784}
candidates 4 in r2c3 and r3c8 (-) are the victims

In the candidate grid:

Code: Select all

.---------------.---------------.---------------.
| 5    7    468 | 46   9    246 | 1    248  3   |
| 3    2   -46  | 8    1    467 |#47   5    9   |
| 9    1   #48  | 5    347  2347| 6   -248 *78  |
:---------------+---------------+---------------:
| 2    89   17  | 179  5    78  | 3    6    4   |
| 17   4    5   | 167  37   367 | 8    9    2   |
| 6    89   3   | 49   2    48  | 5    7    1   |
:---------------+---------------+---------------:
| 47   6    2   | 47   8    1   | 9    3    5   |
| 147  5    17  | 3    6    9   | 2    48   78  |
| 8    3    9   | 2    47   5   | 47   1    6   |
'---------------'---------------'---------------'

After that, a naked triple and remote pairs are the final hurdles.

Ruud.

PS: Your grid was difficult to read, because the extra blanks were removed. It is better to use a non-blank character for empty cells.

[Cec]

"..PS: Your grid was difficult to read, because the extra blanks were removed. It is better to use a non-blank character for empty cells."

I would suggest jgraves should post future grids as described HERE
Cec

[jgraves]

Thank you for the hint.

And I'll fix the grid in future posts... sorry.

[Cec]

"..And I'll fix the grid in future posts... sorry."

Hi jgraves,
And I'm sorry that I didn't word my previous post in a more jovial way
Sometimes when I reply it seems OK at the time but reading it a day or so later sounds kinda "grumpy". I must watch this. Cheers.
Cec