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A Bivalue ER+1 Example

 
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Bud



Joined: 06 May 2010
Posts: 47
Location: Tampa, Florida

PostPosted: Thu Jul 01, 2010 2:01 pm    Post subject: A Bivalue ER+1 Example Reply with quote

I think this is new but I have often been wrong before. The ER+1 box in this example is B6, Note that r6c9 is the +1 cell in this box since it and the ER are both devoid of the digits 3 and 6. The logic is simple. Either cell A is 3 or cell B is 6 and therefore cell C must be either 3 or 6. Since there are no other possibilities, all other digits can be eliminated from cell C. In this case 2 is the only digit that can be eliminated.

Bivalue ER+1 Example
Code:

 |-----------------+-----------------+-----------------|
 |   9   25    6   |   1    3    4   |   8    7   25   |
 | 134  345  145   |   7   26    8   |  26    9   45   |
 |   8   24    7   |   5  269   69   |   3    1  246   |
 |-----------------+-----------------+-----------------|
 | 2347  3457 245  |   8  469   69   |   1   25 -236C  |
 |  34A  3458  9   |  46B   1    2   |   7  568  368   |
 |   6    1   28   |   3    7    5   |   9    4   28   |
 |-----------------+-----------------+-----------------|
 | 247   4678 248  | 246  468    1   |   5    3    9   |
 |   5    9    3   | 246  468    7   |  26  268    1   |
 |  12   68   128  |   9    5    3   |   4  268    7   |
 |-----------------+-----------------+-----------------|


The original puzzle is Sudoku 9981 Extreme Book 48 #7. The only advanced move that I used to reach this point in the puzzle is a finned X-Wing in c69.
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