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Puzzle 11/06/11: ~ XY

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sat Jun 11, 2011 5:48 pm    Post subject: Puzzle 11/06/11: ~ XY Reply with quote

My solver loved this puzzle.

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

Play this puzzle online at the Daily Sudoku site
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Sat Jun 11, 2011 6:26 pm    Post subject: Reply with quote

Danny wrote:
My solver loved this puzzle

I'm guessing because it exercised your "shiny new" subroutine?
Quote:
ur(34)r46c39[(4)r5c1=(6)r6c9] - (6=7)r3c9 - (7=9)r3c2 - (9=4)r2c3 ; r46c3<>4
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Sun Jun 12, 2011 1:33 pm    Post subject: Reply with quote

Peter,

Nice move on the AUR(34) using the mixed internal/external sis.

I usually check for AURs early in my sequence and also noticed the AUR(34) but used all internal sis where (9)r46c3-(9=4)r2c3 making r2c3=4.

A couple of BUG-lites are in r89 that provided useless deletions, but were interesting to work with.

I also made a second pass and found this two stepper.

(8=6)r6c7-(6=1)r6c5-r1c5=r1c2-(1=9)r4c2-r4c8=(9-8)r6c8; r6c8<>8

anp(34=6)r46c9-(6=1)r6c5-(1=7)r1c5-r2c4=r2c8-r3c9=(7-4)r8c9; r8c9<>4=7

Ted
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sun Jun 12, 2011 3:35 pm    Post subject: Reply with quote

Yes, my "shiny new" subroutine had a ball with this puzzle.

Code:
 after basics
 +-----------------------------------------------------------------------+
 |  3      17     6      |  5      17     8      |  4      2      9      |
 |  14     5      4-9    | *16+7   2     *16=9   |  3      67     8      |
 |  8      79     2      |  3467   3679   3469   |  1      5      67     |
 |-----------------------+-----------------------+-----------------------|
 |  6      1-9   *34+9   |  2      8      5      |  7      149   *34     |
 |  14     8      7      |  9      136    1346   |  5      146    2      |
 |  5      2     *34+9   |  146    16     7      |  68     14689 *34+6   |
 |-----------------------+-----------------------+-----------------------|
 |  7      6      1      |  8      4      2      |  9      3      5      |
 |  9      3      58     | *16+7   1567  *16     |  2      4678   467    |
 |  2      4      58     |  367    35679  369    |  68     678    1      |
 +-----------------------------------------------------------------------+
 # 70 eliminations remain

Single-stepper:

Code:
(9=7)r3c2 - (7=6)r3c9 - r6c9 =UR= (9)r46c3  =>  r2c3,r4c2<>9

Two-stepper:

Code:
 r2c9    2-String Kite                   <> 7    r8c4

(9)r2c6 =UR= (7)r2c4 - [ (7=1)r1c5, (7=6)r2c8 ] - (16=9)r2c6

I found a single-stepper variation on the two-stepper:

Code:
(9)r2c6   -or-

(7)r2c4 - [ (7=1)r1c5, (7=6)r2c8 ] - (16=9)r2c6   -or-

(7)r8c4 - r8c9 = r3c9 - (7=6)r2c8 - als(6=9)b2q246
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Marty R.



Joined: 12 Feb 2006
Posts: 5153
Location: Rochester, NY, USA

PostPosted: Mon Jun 13, 2011 10:48 pm    Post subject: Reply with quote

Coloring; r8c4<>7
Type 3 UR (16) in boxes 28 creates pincers; r1c5<>7
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