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MM 1384 April 24

 
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sat Apr 25, 2009 2:23 am    Post subject: MM 1384 April 24 Reply with quote
Code:

+-------+-------+-------+
| . . . | . . . | 6 . . |
| . 8 2 | . 1 . | . . . |
| . 3 9 | 2 . 6 | . . 7 |
+-------+-------+-------+
| . . . | . 9 . | 8 3 . |
| 3 . . | . . . | . . 4 |
| . 7 . | . 3 . | . . . |
+-------+-------+-------+
| 4 . . | 1 . 5 | . 7 . |
| . . . | . 6 . | 5 . . |
| . . 6 | . . . | . 2 . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sun Apr 26, 2009 12:19 am    Post subject: Reply with quote
Code:
.---------------------.---------------------.---------------------.
|D17     14    E147   | 3589   58     389   | 6      59     2     |
| 6      8      2     | 579    1      79    | 349    459    359   |
| 5      3      9     | 2      4      6     | 1      8      7     |
:---------------------+---------------------+---------------------:
| 12     1246   145   | 4567   9      1247  | 8      3      15    |
| 3      1269   158   | 568    258    128   | 7      1569   4     |
| 189    7      1458  | 4568   3      148   | 2      1569   159   |
:---------------------+---------------------+---------------------:
| 4     B29    G38    | 1     A28     5     | 39     7      6     |
| 12789  129   F1378  | 3489   6      23489 | 5      149    1389  |
|C189    5      6     | 3489   7      3489  | 349    2      1389  |
'---------------------'---------------------'---------------------'

{xy-wing(2,8,9)ABC} = (1)C - (1=7)D - (7)E = (7-3)F = (3)G; G is not 8

for all the chain gangers...
if you remove the 1 at C then the xy-wing {2,8,9} at ABC remains.
if you remove the xy-wing {2,8,9}ABC then the 1 at C is left then just follow the chain around to G...
either the 3 at G exists or the pincers {8} at A and C exist (because of the xy-wing).
either way, the 8 can't exist in r7c3

for a one stepper.
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