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Puzzle 10/07/19: XY+

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Mon Jul 19, 2010 3:12 pm    Post subject: Puzzle 10/07/19: XY+ Reply with quote

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

Play this puzzle online at the Daily Sudoku site
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tlanglet



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

PostPosted: Mon Jul 19, 2010 5:47 pm    Post subject: Reply with quote

AUR (38)r34c89 with x-wing 8 overlay; r34c8<>3 which sets up a

w-wing13 r6c7 & r7c6 with SL3 in r257c8
(3)r2c8 -r3c9=r4c9-(3=1)r6c7
(3)r5c8-(3=1)r6c7
(3)r7c8-(3=1)r7c6; r6c6<>1

Almost w-wing (AW-wing) 13 in r1c2 & r2c8 and SL3 in r7c28 with fin (4)r2c8
If w-wing is true: r2c13<>1
If fin is true: (4)r2c8-(4=3)r1c7-(3=1)r1c2; r2c13<>1

RP34 r1c7 & r7c2; r1c2<>3 plus after cleanup,
transport (3)r7c2-r5c2=(3)r5c8; r2c8<>3
transport (3)r7c2-r9c3=(3)r9c4; r1c4<>3

ANP(34=7)r78c2-(7=3)r9c3{*M}-r9c4=r8c45-r8c7=r1c7-r1c5=r2c45-r2c13=r3c23-(3)r3c3{*M}=(3)r3c2; r45c2<>3

I believe that my last step is valid using an earlier step to make a later deletion, but I do not know how to properly notate the move. Comments appreciated.

Ted
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