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Vanhagen Fiendish Nov 13

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tlanglet

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

Posted: Sat Nov 13, 2010 2:48 pm Post subject: Vanhagen Fiendish Nov 13

Enjoy......

Code:

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

Play this puzzle online at the Daily Sudoku site

Marty R.

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

Posted: Sat Nov 13, 2010 5:02 pm Post subject:

Quote:

XY-Chain; r2c9<>4, with pincers at r2c1/r8c9

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Sat Nov 13, 2010 7:14 pm Post subject:

Code:

.---------------.---------------.---------------.
| 1 7 23 | 23 4 5 | 8 6 9 |
| 34 9 8 | 6 7 23 | 5 1 24 |
| 5 6 24 | 8 1 9 | 247 3 247 |
:---------------+---------------+---------------:
| 69 2 13 | 4 8 7 | 19 5 136 |
| 69 4 5 | 12 3 12 | 79 8 67 |
| 37 8 137 | 5 9 6 | 12 4 123 |
:---------------+---------------+---------------:
| 47 1 47 | 9 6 8 | 3 2 5 |
| 8 5 9 | 13 2 134 | 6 7 14 |
| 2 3 6 | 7 5 14 | 14 9 8 |
'---------------'---------------'---------------'

something similar to marty's

(4=1)r8c9 - (1)r8c4 = (1)r5c4 - (1=2)r5c6 - (2)r2c6 = (2)r2c9; r2c9 <> 4

Last edited by storm_norm on Sun Nov 14, 2010 1:47 am; edited 2 times in total

tlanglet

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

Posted: Sat Nov 13, 2010 7:34 pm Post subject:

Two one step solutions and a two step solution.....

Quote:

xy-chain found by extending both ends of a xy-wing;
(4)r3c7=(4)r9c7-(4=1)r9c6-(1=3)r8c4-r1c4=r1c3-(3=4)r2c1; r3c3<>4

AUR(13)r46c39 external SIS r8c9=1,r1c3=3
AUR(13)[{3)r1c3=(1)r8c9]-(1=3)r8c4; r1c4<>3=2

Flightless w-wing (13)r4c3|r8c4 SL (3)r1c34 plus transport: (1)r8c4-r8c9=(1)r9c7
BUG+3; r9c6<>1=4

Ted

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