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Set XY_03 Puzzle 019

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Fri Jun 19, 2009 3:40 pm Post subject: Set XY_03 Puzzle 019

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Not as difficult as #016.

You May Need wrote:

[r9c2]<>7 ... to get around the advanced fish

Code:

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

Play this puzzle online at the Daily Sudoku site

Code:

Templates (A: 1) <> 7 [r9c2] (start w/hint)

+--------------------------------------------------------------------------------+
| 679 57 2 | 17 4 8 | 3 179 1579 |
| 79 4 578 | 127 3 157 | 257 6 125789 |
| 3 578 1 | 27 2567 9 | 2457 478 24578 |
|--------------------------+--------------------------+--------------------------|
| 47 137 347 | 5 178 2 | 9 13478 134678 |
| 8 6 347 | 137 9 137 | 2457 1347 123457 |
| 5 1237 9 | 6 178 4 | 27 1378 12378 |
|--------------------------+--------------------------+--------------------------|
| 1 237 367 | 4 267 367 | 8 5 3679 |
| 467 9 345678 | 378 5678 3567 | 1 2 3467 |
| 2467 2358 345678 | 123789 125678 13567 | 467 3479 34679 |
+--------------------------------------------------------------------------------+
# 147 eliminations remain

c9b3 Locked Candidate 1 <> 1 [r6c9]
c8b6 Locked Candidate 1 <> 4 [r9c8]
c2b1 Locked Candidate 1 <> 5 [r9c2]

XY-Wing [r9c8]/[r3c8]+[r9c2] <> 8 [r3c2]

r57 X-Wing <> 7 [r8c36],[r9c36]

XY-Wing [r8c1]/[r8c5]+[r9c3] <> 5 [r8c3],[r9c5]

UR Type 1 [r12c49] <> 17 [r1c9]

BUG+1 = 8 [r6c8]

Last edited by daj95376 on Sat Jul 04, 2009 4:07 pm; edited 1 time in total

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storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Fri Jun 19, 2009 7:22 pm Post subject:

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Code:

.------------------.------------------.------------------.
| 6 57 2 | 17 4 8 | 3 9 157 |
| 9 4 78 | 17 3 5 | 2 6 178 |
| 3 578 1 | 2 6 9 | 4 78 578 |
:------------------+------------------+------------------:
| 47 1 3 | 5 78 2 | 9 *48 6 |
| 8 6 *47 | 3 9 17 | 5 1-4 2 |
| 5 2 9 | 6 18 4 | 7 138 *38 |
:------------------+------------------+------------------:
| 1 37 67 | 4 2 367 | 8 5 9 |
| 47 9 *4567 | 8 57 *367 | 1 2 *347 |
| 2 378 *4578 | 9 157 137 | 6 37 347 |
'------------------'------------------'------------------'

hp = hidden pair
(4)r5c3 = (hp45)r89c3 - (6)r8c6 = (6-3)r8c6 = (3)r8c9 - (3=8)r6c9 - (8=4)r4c8; r5c8 <> 4

xy-wing {3,7,8} removes 8 from r3c2

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tlanglet

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

Posted: Sun Jun 21, 2009 7:59 pm Post subject:

I used five steps but am not sure that all were required. Type 3 UR17 r12c49 which forces r1c9=5 or r2c9=8; both result in r7c2=3, x-wing 7 r89c36, Type 1 UR17 sets r1c9=5, xy-wing 457 with pivot47 inr8c1, BUG+1 sets r6c8=8. Ted

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Marty R.

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

Posted: Fri Jun 26, 2009 12:12 am Post subject:

Couldn't do it with the conventional techniques. After an ER, UR and skyscraper, I needed a Medusa wrap to get me to the BUG+1.

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