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Puzzle 11/03/03 Difficult+

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Thu Mar 03, 2011 7:05 pm Post subject: Puzzle 11/03/03 Difficult+

Code:

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

Play this puzzle online at the Daily Sudoku site

peterj

Joined: 26 Mar 2010
Posts: 974
Location: London, UK

Posted: Fri Mar 04, 2011 9:43 am Post subject:

Nice puzzle - four steps

Quote:

kite(8) c2, r3 ; r5c6<>8
xy-wing(17-8) r2c1 ; r8c3<>8
m-wing(38) ; (8=3)r1c5 - r2c4=(3-8)r5c4=r5c2 ; r1c2<>8
anp(6=23)r5c46 - (2=4)r5c9 - (4=6)r4c8 ; r4c6<>6, r5c8<>6

tlanglet

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

Posted: Fri Mar 04, 2011 3:52 pm Post subject:

I also had four steps, each building on the prior steps.

Quote:

xy-wing (17-8) vertex (17)r2c1; r8c3<>8

AXY-wing (3-78) vertex (38)r1c5, pincers (78)r3c6 & (37)r9c5 with fin (6)r9c5; r9c6<>7
If fin is true: (6)r9c5-(3)r9c5=(3-7)r9c6

ANP(38=1)r1c56-(1=6)r4c6-(6=3)r9c6-r5c6=(3)r5c4; r2c4<>3

AXY-wing (24-6) vertex (24)r5c9, pincers (46)r4c8 & (26)r5c6 with fin (8)r5c6; r4c6,r5c8<>6
If fin is true: (8)r5c6-r3c6=r3c3-r6c3=(8)r5c2; conflict r5c6<>8

Ted

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