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Puzzle 10/09/20: C

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Mon Sep 20, 2010 2:20 am Post subject: Puzzle 10/09/20: C

Code:

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

Play this puzzle online at the Daily Sudoku site

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Mon Sep 20, 2010 6:10 am Post subject:

Code:

+---------------------+-----------+----------------+
| 3 2 4-7(5) | 9 8 6 | (47) 1 4(5) |
| 1 6 59 | 7 2 4 | 9(5) 8 3 |
| (479) (49) 8 | 5 1 3 | 467 2 469 |
+---------------------+-----------+----------------+
| 6(4) 7 1 | 3 5 2 | 6(4) 9 8 |
| 8 3 2 | 4 6 9 | 1 5 7 |
| 4569 459 469 | 1 7 8 | 2 3 46 |
+---------------------+-----------+----------------+
| 24569 1 3469 | 26 34 7 | 8 46 59 |
| 4567 (45) 3467 | 8 9 1 | 3(5) 46 2 |
| 2469 8 3469 | 26 34 5 | 39 7 1 |
+---------------------+-----------+----------------+

the w-wing {4,7} with pincers in r3c1 and r1c7, strong links on 4 in r4, would be there if the 9 was false in r3c1...

if the 9 is true...
(9)r3c1 - (9=4)r3c2 - (4=5)r8c2 - (5)r8c7 = (5)r2c7 - (5)r1c9 = (5)r1c3

either way the 7 in r1c3 can't exist. for a one stepper.

also written as...

(4)r3c1 - (4)r4c1 = (4)r4c7 - (4=7)r1c7
||
(7)r3c1
||
(9)r3c1 - (9=4)r3c2 - (4=5)r8c2 - (5)r8c7 = (5)r2c7 - (5)r1c9 = (5)r1c3

JC Van Hay

Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

Posted: Mon Sep 20, 2010 10:39 am Post subject:

Idem, but killing the (9)r3c1 first ...

Quote:

Finned X Wing (9)R29 : => r7c3<>9
X Wing (9)R29 : => r36c37<>9
W Wing (47) : (74)R3C1 4R4 (47)R1C7 : => r1c3,r3c7<>7

Marty R.

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

Posted: Tue Sep 21, 2010 4:27 pm Post subject:

I tried a Ted-style external analysis, having no idea if I was doing it right, but it yielded r8c3<>3 and r1c7=7, which solved the puzzle.

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