dailysudoku.com Forum Index dailysudoku.com
Discussion of Daily Sudoku puzzles
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Set XY_03 Puzzle 042

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Puzzles by daj
View previous topic :: View next topic  
Author Message
daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Oct 17, 2009 10:41 pm    Post subject: Set XY_03 Puzzle 042 Reply with quote
Code:
XY puzzles can be solved using these techniques:

Basics:  Naked/Hidden Single, Naked Pair/Triple, Locked Candidates 1/2
Basics+: Naked Quad, Hidden Pair/Triple/Quad
VH:      BUG+1, UR Type 1, X-Wing, XY-Wing
VH+:     2-String Kite, Empty Rectangle, Remote Pair, Skyscraper,
         XYZ-Wing, finned X-Wing, UR Type 2/4
XY:      gM-Wing, W-Wing, XY-Chain, BUG+2, BUG+3, other URs


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

Play this puzzle online at the Daily Sudoku site
Back to top
View user's profile Send private message
tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Mon Oct 19, 2009 3:33 pm    Post subject: Reply with quote
I started this puzzle with a Kreken swordfish 8 in r489c467 and the Kraken fin in r9c8. If the swordfish is true then the eliminations are in r5c4 and r56c6. If the Kraken fin is true then (8)r9c8 - (8)r8c7 = (8)r8c6 - (8)r56c6; thus, r56c6<>8 since both the swordfish and the fin remove them.
Next a ER 9 with hinge in box4 and strong link in col7,
xy-wing 18-9 with vertex 18 in r5c8 makes one deletion AND transporting 9 in r4c7 to r9c9 also makes a second deletion,
A type 2 UR 59 in r79c14 deletes 4 in r9c256,
kite 9 with hinge in box6,
xyz-wing in r9c4 deletes 5 in r9c5,
x-wing 4 in r49c14 finally does the deed.

Ted
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Puzzles by daj All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group