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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Mar 05, 2011 7:45 pm Post subject: Puzzle 11/03/05: ~ Difficult+ |
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| Code: | +-----------------------+
| . 1 . | . . . | . . . |
| 7 . . | 6 . 5 | 4 1 . |
| . . 4 | . 1 . | 6 . . |
|-------+-------+-------|
| . 2 . | 5 . 3 | . 6 . |
| . . 6 | . . . | 2 . . |
| . 4 . | 9 . 2 | . . 5 |
|-------+-------+-------|
| . 5 1 | . 3 . | 7 . 6 |
| . 7 . | 1 . . | . 4 . |
| . . . | . . 7 | 1 . 2 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sun Mar 06, 2011 10:23 am Post subject: |
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Lots of colouring/turbot moves...
| Quote: | kite(3) r6, c8 ; r9c3<>3
kite(3) r5, c7 transport c4 ; r3c2<>3
kite(9) r5, c7 transport r3 ; r1c56<>9 |
The last two kites can sort of be played together as a remotepair(39) via an als/pseudocell (3=8=9)r46c7 and using the transport of (3)r1c4=r3c4. Tenuous though! |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Mon Mar 07, 2011 2:18 pm Post subject: |
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Interesting puzzle. I found many moves but they did not result in any significant benefit; some advanced moves were available but they also seemed to be non-destructive. A BBDBer for me.
ANP(89=3)r3c26-r5c2=r5c8-r6c7=r1c7-r2c9=r2c23- conflict; r3c2<>3
ANP(39=8)b3q16-r2c2=r3c2-(8=9)r3c6-r7c6=r8c5-(9=3)r8c9; r13c9<>3
Coloring 3; r2c3, r8c1, r9c3<>3
x-wing (2)r37c14; r8c1<>2
coloring 9; r7c8<>9
Ted |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Mon Mar 07, 2011 4:38 pm Post subject: |
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Since I don't activate Colors and Multi-Colors techniques when preparing puzzles for this forum, I was unaware that they would crack this puzzle so easily. (Thanks Peter.) My solver's solution was a BBDB. However, with only three steps necessary, this then eliminated the BBDB classification.
| Code: | c35 X-Wing <> 2 r8c1 complementary and
r37 X-Wing <> 2 r8c1 extraneous
r6c8 2-String Kite <> 3 r9c3
<79+8> XYZ-Wing r1c5/r3c6+r5c5 <> 8 r2c5 extraneous
<49+8> XYZ-Wing r7c6/r7c8+r9c4 <> 8 r7c4 extraneous
<38+9> XYZ-Wing r8c1/r8c9+r9c3 <> 9 r8c3 extraneous
+--------------------------------------------------------------+
| 6 1 5 | 3478 789 489 | 39 2 3789 |
| 7 389 239 | 6 29 5 | 4 1 389 |
| 239 389 4 | 2378 1 89 | 6 5 3789 |
|--------------------+--------------------+--------------------|
| 89 2 7 | 5 4 3 | 89 6 1 |
| 5 39 6 | 78 78 1 | 2 39 4 |
| 1 4 38 | 9 6 2 | 38 7 5 |
|--------------------+--------------------+--------------------|
| 2489 5 1 | 24 3 489 | 7 89 6 |
| 389 7 238 | 1 289 6 | 5 4 39 |
| 3489 6 89 | 48 5 7 | 1 389 2 |
+--------------------------------------------------------------+
# 58 eliminations remain
XY-Chain: (8=9)r4c1 =3r5c2 =9r5c8 =8r7c8 => r7c1<>8 extraneous
(3): r3c4 = r1c4 - r1c7 = r6c7 - r6c3 = r5c2 => r3c2<>3 ( a.k.a. ...
Sashimi Franken Swordfish c47b4\r136 w/fin cell r5c2 )
XY-Chain: (9=3)r1c7 =8r6c7 =3r6c3 =9r5c2 =8r3c2 =9r3c6 => r1c56<>9
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