The New Sudoku Players' Forum

[rjamil]

Hi yzfwsf,

If the whole structure is zero rank, it is named Complete XYZ Ring; otherwise, it is named Half XYZ Ring.

Thanks for providing the definition of techniques naming convention (nomenclature).

However, I have drawback about the same and totally rely on pattern based techniques. I ignore something sometimes and move on as long as my program produces good results.

I have collected and/or derived similar to me look-a-like patterns under one technique name for which, I understand, am wrong several times and ways. But again, my goal is to solve the bulk vanilla Sudoku puzzle with short and simple steps in fast way, coded for minimum duplicate search algorithm/logic.

Therefore, I totally rely on experts, just like one of you as well, to learn.

The pattern in discussion reminds me that it is something like 46th pattern of XY-Wing Transport ERI Ring that is missing in XYZ-Transport ERI Ring category (wrongly identified under Dual XYZ-Hybrid move first). Maybe, I am right and clear now at that point.

So, please accept my apology, if it creates some confusion and withdraw my suggestion of Half naming.

R. Jamil

[yzfwsf]

Hi R. Jamil,
XYZ Ring should be a subset of XYZ Transport, so what you said should be correct, but my solver only implements this simplified version of XYZ Transport, or it is designed on purpose. If XYZ Transport is completely included, it will be repeated with AIC. This can provide users with a simple version of AIC to reduce the slope of the learning curve.

[rjamil]

Hi yzfwsf,

Once again, thanks for your confirmation and valuable guidance.

However, I extracted XYZ-Hybrid technique from XYZ-Transport technique, and, coded one pattern under one technique only. Understand now than it also fall under XYZ-Ring technique in Chinese.

R. Jamil

[rjamil]

Hi experts,

Checking feasibility for above discussed XYZ-Transport ERI Ring pattern # 46, found following example 17 clue puzzle for test case:

Code: Select all

................12....34.........3.......54.6.17.........8.....3.....79.4..21....
 +------------------+----------------+------------+
 |-5789  5689  5689 | 579  2    -1   | 589  4   3 |
 |*579  -34   -34   |-6   -8    *79  |-59  -1  -2 | -7
 |-1     589   2    | 59   3    -4   | 589  6   7 |
 +------------------+----------------+------------+
 |-589   4589  4589 | 79   6    -2   | 3    78  1 |
 |-2     389   389  | 1    79   -5   | 4    78  6 |
 |-6     1     7    | 3    4    -8   | 2    5   9 |
 +------------------+----------------+------------+
 |*59   -5679 -569  | 8    7[9] (3)  |-1   -2  -4 | -9X
 |-3     2     1    | 4    5     6   | 7    9   8 |
 |-4     789   89   | 2    1     7[9]| 6    3   5 |
 +------------------+----------------+------------+
  -5                            -9X

After basics and a Skyscrapper moves, puzzle state reached as above:
XYZ-Transport: ERI Ring 579 @ r2c16 r7c1 ERI 9 @ b8r7c6 => eliminations as mentioned.
(Note: digit 9 eliminations included but not implemented for XYZ-Transport, showing difference with XY-Wing Transport ERI Ring move.)

R. Jamil

[yzfwsf]

The overall structure is zero rank, but the position of the two links of 9 is uncertain, so we can only delete 5 and 7, so it is called Half XYZ Ring in YZF_sudoku.
The whole structure can finally be filled with one 7, one 5, and two 9, but the specific place of 5 is uncertain, but 5 must appear in column 1, and 7 must appear in row 2

[rjamil]

Hi yzfwsf,

YZF_Sudoku shows:

Half XYZ-Ring: 579 in r2c1,r2c6,r7c1+9r9 => r14c1<>5

As yzfwsf stated above.

Note: I have included elimination of digit 9 only to show if it is XY-Wing Transport ERI Ring move. Will it also be Rank 0 and called Half XY Ring move in Chinese?

R. Jamil

[rjamil]

Another 17 clue example puzzle:

Code: Select all

................12..3..4........54...6..1....72...........6......5...34..81.2....
 +-------------+------------+--------------+
 | 89   57   2 | 1   589  6 | 579  3    4  |
 | 489  45   6 | 89  3    7 | 59   1    2  |
 | 19   157  3 | 2   59   4 | 6    579  8  |
 +-------------+------------+--------------+
 | 13   13   8 | 6   79   5 | 4    2    79 |
 | 5    6    4 | 79  1    2 | 8    79   3  |
 | 7    2    9 | 3   4    8 | 1    6    5  |
 +-------------+------------+--------------+
 | 34   34   7 | 5   6    9 | 2    8    1  |
 | 2    9    5 | 78  78   1 | 3    4    6  |
 | 6    8    1 | 4   2    3 | 579  579  79 |
 +-------------+------------+--------------+

After singleton moves, above mentioned puzzle state reached:
XYZ-Transport: ERI Ring 579 @ r3c58 r5c8 ERI 9 @ b5r5c5 => -5 @ r3c2 => -7 @ r9c8

YZF_Sudoku: Half XYZ-Ring: 579 in r3c8,r3c5,r5c8+9r4 => r3c2<>5, r9c8<>7

R. Jamil

[rjamil]

Ok. This one is the last example of Half XYZ-Ring move:

After several basic moves, puzzle pencilmark state reached as below:

Code: Select all

................12..3..4..5.....5....1.....67.8...9.......1..8...5...9..4...6....
 +--------------------+------------------+--------------+
 | 2679   2579  26789 | 237   2359   1   | 378  4    89 |
 | 79     4579  4789  | 37    359    6   | 378  1    2  |
 | 1      279   3     | 278   289    4   | 6    79   5  |
 +--------------------+------------------+--------------+
 | 2367   2347  2467  | 16    23478  5   | 128  239  89 |
 | 2359   1     249   | 2348  2348   23  | 258  6    7  |
 | 23567  8     267   | 16    237    9   | 125  235  4  |
 +--------------------+------------------+--------------+
 | 2379   2379  279   | 5     1      27  | 4    8    6  |
 | 8      6     5     | 234   234    237 | 9    27   1  |
 | 4      27    1     | 9     6      8   | 257  257  3  |
 +--------------------+------------------+--------------+

XYZ-Transport: ERI Ring 279 @ r3c28 r9c2 ERI 7 @ b9r9c8 => -9 @ r3c5 => -2 @ r147c2

Whereas YZF_Sudoku gives two Half XYZ-Ring moves (twice) as next step:
Half XYZ-Ring: 279 in r3c2,r3c8,r9c2+7c7 => r3c5<>9, r147c2<>2
Half XYZ-Ring: 279 in r3c2,r3c8,r9c2+7b9 => r3c5<>9, r147c2<>2

R. Jamil
Note: my program prefers XYZ-Wing move (XYZ-Wing: 279 @ r39c2 r2c1 => -7 @ r12c2) first, which is also available as all possible steps in YZF_Sudoku, but prefers (Half XYZ-Ring: 279 in r3c2,r3c8,r9c2+7c7 => r3c5<>9, r147c2<>2) as next step. Investigating...