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Puzzle 11/02/22 Difficult/Extreme ?

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Tue Feb 22, 2011 3:47 am Post subject: Puzzle 11/02/22 Difficult/Extreme ?

Code:

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

Play this puzzle online at the Daily Sudoku site

tlanglet

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

Posted: Tue Feb 22, 2011 7:43 pm Post subject:

#1: Type 1 UR(68)r46c49; r6c4<>68=3
#2: Flightless skyscraper 8: r4c4=r4c9-r6c9=r6c3-r1c3=r3c2; r3c4<>8

Code:

*-----------------------------------------------------------*
| 5 7 38 | 268 1 2368 | 36 9 4 |
| 2 46 34 | 5 #346 9 | 1 8 7 |
| 1 468 9 |#46 467-3 678-3 |#36 5 2 |
|-------------------+-------------------+-------------------|
| 9 3 1 | 68 2 57 | 57 4 68 |
| 67 48 458 | 1 567 5678 | 2 3 9 |
| 67 2 58 | 3 9 4 | 57 1 68 |
|-------------------+-------------------+-------------------|
| 3 9 7 | 24 45 25 | 8 6 1 |
| 8 1 2 | 9 36 36 | 4 7 5 |
| 4 5 6 | 7 8 1 | 9 2 3 |
*-----------------------------------------------------------*

#3: AXY-wing -346 vertex (46)r3c4 with fin (6)r2c5; r3c56<>3
If fin is true: (6)r2c5-r1c46=r1c7-(6=3)r3c7

Code:

*-----------------------------------------------------------*
| 5 7 38 | 28 1 238 | 6 9 4 |
| 2 46 34 | 5 346 9 | 1 8 7 |
| 1 468 9 | 46 467 678 | 3 5 2 |
|-------------------+-------------------+-------------------|
| 9 3 1 | 68 2 57 | 57 4 68 |
| 67 48 458 | 1 567 5678 | 2 3 9 |
| 67 2 58 | 3 9 4 | 57 1 68 |
|-------------------+-------------------+-------------------|
| 3 9 7 | 24 45 25 | 8 6 1 |
| 8 1 2 | 9 36 36 | 4 7 5 |
| 4 5 6 | 7 8 1 | 9 2 3 |
*-----------------------------------------------------------*

#4: AUR(46)r23c25 sis: r5c2=4,r7c5=4,r3c46=6; r3c2<>6
(4)r5c2-(4=6)r2c2
(4)r7c5-(4=2)r7c4-(2=8)r1c4-(8=3)r1c3-(3=4)2c3-(4=6)r2c2
(6)r3c46

#5: xy-wing 34-6 vertex (34)r2c5; r3c5<>6

Code:

*-----------------------------------------------------------*
| 5 7 38 | 28 1 238 | 6 9 4 |
| 2 6 34 | 5 34 9 | 1 8 7 |
| 1 48 9 | 46 47 678 | 3 5 2 |
|-------------------+-------------------+-------------------|
| 9 3 1 | 68 2 57 | 57 4 68 |
| 67 48 458 | 1 567 5678 | 2 3 9 |
| 67 2 58 | 3 9 4 | 57 1 68 |
|-------------------+-------------------+-------------------|
| 3 9 7 | 24 45 25 | 8 6 1 |
| 8 1 2 | 9 36 36 | 4 7 5 |
| 4 5 6 | 7 8 1 | 9 2 3 |
*-----------------------------------------------------------*

#6: AXY-wing 4-67 vertex (47)r3c5 with fin (5)r5c5; r4c4<>6
If fin is true: (5)r5c5-r5c3=(5-8)r6c3=r6c9-(8=6)r4c9

Ted

Marty R.

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

Posted: Wed Feb 23, 2011 11:50 pm Post subject:

I used the 68 UR, a Finned X-Wing and two XYZ-Wings to little avail, then turned to Medusa and a wrap finished things off.

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Thu Feb 24, 2011 1:32 am Post subject:

Code:

r46c49 <68> UR Type 1.2223 <> 68 r6c4

c2b5 turbot fish/ER <> 8 r3c4

<34+6> XYZ-Wing r2c5/r3c4+r8c5 <> 6 r3c5 extraneous
<56+7> XYZ-Wing r5c5/r4c6+r5c1 <> 7 r5c6 extraneous

9-cell XY-Chain:

(6=8)r4c9 =6r4c4 =4r3c4 =2r7c4 =5r7c6 =7r4c6 =5r4c7 =7r6c7 =6r6c1 => r6c9<>6

BUG+1 = 3 r1c6
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