The New Sudoku Players' Forum

[ArkieTech]

Code: Select all

 *-----------*
 |58.|9.2|..3|
 |..4|...|6..|
 |...|4.1|...|
 |---+---+---|
 |9.3|.4.|2.1|
 |...|7.6|...|
 |4.6|.1.|3.7|
 |---+---+---|
 |...|1.8|.3.|
 |..5|...|..9|
 |1..|3.4|..6|
 *-----------*


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[storm_norm22]

just basic coloring on 2's

[Leren]

Code: Select all

*--------------------------------------------------------------------------------*
| 5       8       17       | 9       6       2        | 147     147     3        |
|a27      19      4        | 5       78      3        | 6       19     b28       |
| 36      36      279      | 4       78      1        | 579     2579    258      |
|--------------------------+--------------------------+--------------------------|
| 9       7       3        | 8       4       5        | 2       6       1        |
| -28    F12      128      | 7       3       6        | 459     459     45       |
| 4       5       6        | 2       1       9        | 3       8       7        |
|--------------------------+--------------------------+--------------------------|
|c267     46     f279      | 1       59      8        | 457     3      d245      |
| 38      34      5        | 6       2       7        | 148     14      9        |
| 1       29      2789     | 3       59      4        | 578     257     6        |
*--------------------------------------------------------------------------------*

Finned XWing in 2's r27c19 fin r7c3 transport to r5c2 => r5c1<2>

[Marty R.]

Code: Select all

+-------------+--------+--------------+
| 5   8  17   | 9 6  2 | 147 147  3   |
| 27  19 4    | 5 78 3 | 6   19   28  |
| 36  36 279  | 4 78 1 | 579 2579 258 |
+-------------+--------+--------------+
| 9   7  3    | 8 4  5 | 2   6    1   |
| 28  12 128  | 7 3  6 | 459 459  45  |
| 4   5  6    | 2 1  9 | 3   8    7   |
+-------------+--------+--------------+
| 267 46 279  | 1 59 8 | 457 3    245 |
| 38  34 5    | 6 2  7 | 148 14   9   |
| 1   29 2789 | 3 59 4 | 578 257  6   |
+-------------+--------+--------------+


Play this puzzle online at the Daily Sudoku site

I saw an M-Wing on 29.
(2=9)r9c2-r2c2=(9-2)r3c3=2r2c1. This makes an elimination of no consequence, but transporting the 2 from r9c2 to r7c9 to set r2c9<>2 finishes the puzzle. I don't know how to combine the basic M-Wing with the transport into one notation string.

[ArkieTech]

Code: Select all

+-------------+--------+--------------+
| 5   8  17   | 9 6  2 | 147 147  3   |
| 27  19 4    | 5 78 3 | 6   19   28  |
| 36  36 279  | 4 78 1 | 579 2579 258 |
+-------------+--------+--------------+
| 9   7  3    | 8 4  5 | 2   6    1   |
| 28  12 128  | 7 3  6 | 459 459  45  |
| 4   5  6    | 2 1  9 | 3   8    7   |
+-------------+--------+--------------+
| 267 46 279  | 1 59 8 | 457 3    245 |
| 38  34 5    | 6 2  7 | 148 14   9   |
| 1   29 2789 | 3 59 4 | 578 257  6   |
+-------------+--------+--------------+


Play this puzzle online at the Daily Sudoku site

I saw an M-Wing on 29.
(2=9)r9c2-r2c2=(9-2)r3c3=2r2c1. This makes an elimination of no consequence, but transporting the 2 from r9c2 to r7c9 to set r2c9<>2 finishes the puzzle. I don't know how to combine the basic M-Wing with the transport into one notation string.

How is this:

2r7c9=r9c8-(2=9)r9c2-r2c2=(9-2)r3c3=2r2c1 => -2r2c9

[Marty R.]

How is this:

2r7c9=r9c8-(2=9)r9c2-r2c2=(9-2)r3c3=2r2c1 => -2r2c9

Looks good to me. I wanted to start out that way, but got confused. When actually visualizing the move it was "if r9c2 is 2 then r7c9 is 2." In the notation it appears that both those two cells are not equal to 2.

Also, intuitively, the term 2r7c9 seems to mean "if r7c9=2", but here it means if r7c9<>2. Does a term like xr1c1 always mean x is false or could it mean true or false depending on the context?

[ArkieTech]

When actually visualizing the move it was "if r9c2 is 2 then r7c9 is 2." In the notation it appears that both those two cells are not equal to 2.

Also, intuitively, the term 2r7c9 seems to mean "if r7c9=2", but here it means if r7c9<>2. Does a term like xr1c1 always mean x is false or could it mean true or false depending on the context?

I do it a little differently. I know one end of the notation must be a 2 for it to work. So I start with what if r7c9 is not 2. Then r9c8 is a 2 and r9c2 is 9 r2c2 is not a 9 r3c3 is a 9 making the end r2c1 a 2 removing a 2 in r2c9

Hope this helps.