Vanhegan Extreme March 29, 2013

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Vanhegan Extreme March 29, 2013

Postby ArkieTech » Fri Mar 29, 2013 3:24 am

Code: Select all
 *-----------*
 |6..|...|..2|
 |.82|.6.|31.|
 |49.|...|.85|
 |---+---+---|
 |...|732|...|
 |..9|8.5|7..|
 |...|691|...|
 |---+---+---|
 |25.|...|.38|
 |.48|.2.|56.|
 |1..|...|..9|
 *-----------*


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dan
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Re: Vanhegan Extreme March 29, 2013

Postby Leren » Fri Mar 29, 2013 4:25 am

Code: Select all
*-----------------------------------------------------*
| 6   d37   1357  | 13   58   48    | 49  e479  2     |
| 57   8    2     | 459  6    49    | 3    1    47    |
| 4    9   c13    | 2    17  b37    | 6    8    5     |
|-----------------+-----------------+-----------------|
| 58   16   45    | 7    3    2     | 1489 459  146   |
| 3    16   9     | 8    4    5     | 7    2    16    |
| 578  2    457   | 6    9    1     | 48   45   3     |
|-----------------+-----------------+-----------------|
| 2    5    67    | 49   17   469   | 14   3    8     |
| 9    4    8     | 13   2   a37    | 5    6    1-7   |
| 1    37   367   | 45   58   468   | 2   f47   9     |
*-----------------------------------------------------*

w-wing with pincer transport: (7=3) r8c6 - r3c6 = r3c3 - (3=7) r1c2 - r1c8 = r9c8 => -7 r8c9; stte

Also (not shown in PM) xy-wing with pincer transport: (7=3) r1c2 - (3=1) r1c4 - (1=7) r3c5 - r7c5 = r7c3 => -7 r1c3, r9c2; stte

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Re: Vanhegan Extreme March 29, 2013

Postby pjb » Fri Mar 29, 2013 6:24 am

The UR type 1 of 16's at r45c29 leads to r4c9 <> 16: stte.

Phil
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Re: Vanhegan Extreme March 29, 2013

Postby blue » Fri Mar 29, 2013 6:41 am

Code: Select all
+--------------+---------------+----------------+
| 6    37  135 | 13   58   48  | 49    479  2   |
| 57   8   2   | 459  6    49  | 3     1    47  |
| 4    9   13  | 2    7-1  37  | 6     8    5   |
+--------------+---------------+----------------+
| 58   16  45  | 7    3    2   | 1489  459  146 |
| 3    16  9   | 8    4    5   | 7     2    16  |
| 578  2   457 | 6    9    1   | 48    45   3   |
+--------------+---------------+----------------+
| 2    5   67  | 49   17   469 | 14    3    8   |
| 9    4   8   | 13   2    37  | 5     6    17  |
| 1    37  36  | 45   58   468 | 2     47   9   |
+--------------+---------------+----------------+

Old school: (1=3)r3c3 - (3=6)r9c3 - (6=7)r7c3 - (7=1)r7c5 => -1r3c5; stte

I took the x-wing in 7's too, for the PM grid. Is that non-standard ?

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Re: Vanhegan Extreme March 29, 2013

Postby Marty R. » Sat Mar 30, 2013 1:04 am

Code: Select all
+-------------+------------+--------------+
| 6   37 1357 | 13  58 48  | 49   479 2   |
| 57  8  2    | 459 6  49  | 3    1   47  |
| 4   9  13   | 2   17 37  | 6    8   5   |
+-------------+------------+--------------+
| 58  16 45   | 7   3  2   | 1489 459 146 |
| 3   16 9    | 8   4  5   | 7    2   16  |
| 578 2  457  | 6   9  1   | 48   45  3   |
+-------------+------------+--------------+
| 2   5  67   | 49  17 469 | 14   3   8   |
| 9   4  8    | 13  2  37  | 5    6   17  |
| 1   37 367  | 45  58 468 | 2    47  9   |
+-------------+------------+--------------+

Play this puzzle online at the Daily Sudoku site

Same elimination as Leren's W-Wing, but with what would be an XY-Chain except for one trivalue. :D

(7=4)r2c9-(49=5)r2c64-(5=4)r9c4-(4=7)r9c8=>r8c9<>7
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Re: Vanhegan Extreme March 29, 2013

Postby daj95376 » Sat Mar 30, 2013 6:25 pm

blue wrote:Old school: (1=3)r3c3 - (3=6)r9c3 - (6=7)r7c3 - (7=1)r7c5 => -1r3c5; stte

I took the x-wing in 7's too, for the PM grid. Is that non-standard ?

Most try to solve a puzzle with one step after basics. However, single-step solutions aren't mandatory. In fact, they sometimes obscure a more reasonable multi-step solution, IMO.
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