## Please help with strategy

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

### Please help with strategy

Hi folks,

Please help with the following puzzle. I can't find figure out a strategy to solve the next number.

Thanks and I appreciate your help!
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bananafish

Posts: 2
Joined: 25 May 2016

### Re: Please help with strategy

.2.567.49796..1.....5..9..68.9654.2.5.297..64..421.9.52...9........8..929..7.2...

One approach is to use an ALS-XZ.

JasonLion
2017 Supporter

Posts: 641
Joined: 25 October 2007
Location: Silver Spring, MD, USA

### Re: Please help with strategy

You're heading for trouble. You have an incorrect elimination in r7c3.
Steve

SteveG48
2019 Supporter

Posts: 2946
Joined: 08 November 2013
Location: Orlando, Florida

### Re: Please help with strategy

Code: Select all
`+---------------------+-----------------+------------------------+| 13    2        138  | 5    6       7  | 138       4       9    || 7     9        6    | 348  3-4(2)  1  | 38(25)    38(5)   38   || 134   348      5    | 38   23      9  | 12378     1378    6    |+---------------------+-----------------+------------------------+| 8     137      9    | 6    5       4  | 137       2       137  || 5     13       2    | 9    7       38 | 138       6       4    || 36    367      4    | 2    1       38 | 9         378     5    |+---------------------+-----------------+------------------------+| 2     34568    1378 | 134  9       56 | 1345678   13578   1378 || 1346  3456     137  | 134  8       56 | 134567    9       2    || 9     38(456)  138  | 7    3(4)    2  | 138(456)  138(5)  138  |+---------------------+-----------------+------------------------+`
[HP(25)r2c57=5r2c8-5r9c8=HT(456)r9c257]-4r2c5=4r9c5
or
[2r2c5==5r2c8-5r9c8==4r9c5]-4r2c5=4r9c5
JC Van Hay

Posts: 719
Joined: 22 May 2010

### Re: Please help with strategy

Here's the ALS move that Jason was referring to :

Code: Select all
`*--------------------------------------------------------------------------------*| 13      2       138      | 5       6       7        | 138     4       9        || 7       9       6        |a348     23-4    1        | 2358   a358    a38       || 134     348     5        | 38      23      9        | 12378   1378    6        ||--------------------------+--------------------------+--------------------------|| 8       137     9        | 6       5       4        | 137     2       137      || 5       13      2        | 9       7       38       | 138     6       4        || 36      367     4        | 2       1       38       | 9       378     5        ||--------------------------+--------------------------+--------------------------|| 2       34568   1378     | 13-4    9       56       | 1345678 13578   1378     || 1346    3456    137      | 13-4    8       56       | 134567  9       2        || 9       34568  b138      | 7      b34      2        | 134568 b1358   b138      |*--------------------------------------------------------------------------------*`

ALS XZ Rule: X = 5, Z = 4: (4=5) r2c489 - (5=4) r9c3589 => - 4 r2c5, r78c4.

After that the puzzle solves with a pointing pair of 1's in Column 1, a claiming triple of 3's in Column 3 Box 7, a naked triple 456 in Row 8 and singles from there.

r7c3 solves to 1, so you have made an error at some point leading to your diagram, as Steve pointed out.

Leren
Last edited by Leren on Wed Jun 01, 2016 2:41 am, edited 1 time in total.
Leren

Posts: 3857
Joined: 03 June 2012

### Re: Please help with strategy

Thank you! Very much appreciate sharing the strategies and pointing out the problems! Looks like I have some Sudoku strategy studying to do.
bananafish

Posts: 2
Joined: 25 May 2016

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