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Puzzle 11/02/25 Difficult+

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Fri Feb 25, 2011 6:42 pm Post subject: Puzzle 11/02/25 Difficult+

Code:

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

Play this puzzle online at the Daily Sudoku site

peterj

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

Posted: Fri Feb 25, 2011 11:14 pm Post subject:

Tough! I needed a full fledged AIC to open up some turbot moves...

Quote:

AIC (7=4)r6c8 - (4=9)r6c3 - r1c3=(9-6)r1c8=r8c8 ; r8c8<>7
er(1&5) b1, r7 ; r3c9<>15
skyscraper(4) r1, r4 ; r3c1<>4, r6c3<>4

Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Sun Feb 27, 2011 1:59 am Post subject:

I needed a Medusa wrap and a bunch of other moves to crack this baby.

tlanglet

Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

Posted: Mon Feb 28, 2011 4:13 pm Post subject:

Code after basics.....

Code:

*--------------------------------------------------------------------*
| 3 8 49 | 7 2 15 | 45 14569 1456 |
| 2 6 15 | 9 4 15 | 3 8 7 |
| 1459 149 7 | 6 8 3 | 245 1459 1245 |
|----------------------+----------------------+----------------------|
|#47 3 2 | 1 9 6 | 457 457 8 |
| 8 5 6 | 4 3 7 | 1 2 9 |
| 147-9 1479 #49 | 2 5 8 | 6 47 3 |
|----------------------+----------------------+----------------------|
| 156 2 15 | 8 7 4 | 9 3 156 |
|#79=46 479 3 | 5 1 2 | 8 467 46 |
| 1457 147 8 | 3 6 9 | 2457 1457 1245 |
*--------------------------------------------------------------------*

#1: AXY-wing (47-9) vertex (47)r4c1, pincers (49)r6c3 & (79)r8c1 with fins (46)r8c1; r6c1<>9
If fin is true: (46)r8c1-als(46=7)r8c89-(7=4)r6c8-(4=9)r6c3

Which opens up:

Code:

*--------------------------------------------------------------------*
| 3 8 #49 | 7 2 15 |#45 14569 1456 |
| 2 6 15 | 9 4 15 | 3 8 7 |
|#59=14 149 7 | 6 8 3 | 24-5 149-5 124-5 |
|----------------------+----------------------+----------------------|
| 47 3 2 | 1 9 6 | 457 457 8 |
| 8 5 6 | 4 3 7 | 1 2 9 |
| 147 1479 49 | 2 5 8 | 6 47 3 |
|----------------------+----------------------+----------------------|
| 156 2 15 | 8 7 4 | 9 3 156 |
| 4679 479 3 | 5 1 2 | 8 467 46 |
| 1457 147 8 | 3 6 9 | 2457 1457 1245 |
*--------------------------------------------------------------------*

#2: AXY-wing(4-59) vertex (49)r1c3, pincers (45)r1c7 & (59)r3c1 with fins (14)r3c1; r3c789<>5
If fins are true:
(1)r3c1-r6c1=(1-9)r6c2=r6c3-(9=4)r1c3-(4=5)r1c7
(4)r3c1-als(147=5)r469c1-r9c789=(5)r7c9; r3c9<>5
(4)r3c1-(4=7=1)r46c1-(17=49)r6c23-(4=7)r6c8-(7=45)r14c7; r3c7<>5
(4)r3c1-(4=9)r1c3-r1c8=(9-5)r3c8; r3c8<>5

Yes, it looks like a mess. Please comment if anyone sees a better technique.

Ted

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Mon Feb 28, 2011 5:35 pm Post subject:

I took this puzzle from a file of Extreme puzzles. My solver's solution matches Peter's solution exactly.

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