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Puzzle 10/08/17: C

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Tue Aug 17, 2010 5:20 am    Post subject: Puzzle 10/08/17: C Reply with quote
Code:
 +-----------------------+
 | 4 . 3 | . . 6 | . . 9 |
 | . . . | . . . | . . . |
 | 7 . 6 | 2 . 3 | . . . |
 |-------+-------+-------|
 | . . 2 | 7 . 1 | 3 . . |
 | . . . | . . . | . . 1 |
 | 6 . 1 | 9 . 4 | 2 . 7 |
 |-------+-------+-------|
 | . . . | 3 . 7 | . 1 5 |
 | . . . | . . . | 7 6 . |
 | 2 . . | . 1 5 | 8 . . |
 +-----------------------+

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: Tue Aug 17, 2010 5:45 pm    Post subject: Reply with quote
Fun, fun puzzle Exclamation

Quote:
xy-wing 5-89 vertex (59)r3c5; r1c5<>8 plus transport (8)r2c6-r2c3=(8)r1c2; r4c2<>8 which sets up

ANP(58=1-8)r15c4=(8)r1c2-(8=5)r6c2-r123c2=(5)r2c1; r2c4<>5 and (8)r1c2-r56c2=(8)r5c3; r5c4<>8 which sets up

BUG-lite (257)r12c258: r12c2=1, r1c2=8, or r2c5=4 to prevent DP
(1)r12c2-(1=5)r2c1
(8)r1c2-(8=5)r6c2-r4c1=(5)r2c1;
(4)r2c5-(4=1)r2c4-(1=5)r2c1

BUG+1 forces r1c2=1 to complete the puzzle

Ted
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
PostPosted: Tue Aug 17, 2010 6:28 pm    Post subject: Reply with quote
Quote:
XY Wing : (85)R4C5 (59)R3C5 (98)R2C6 : => r1c5<>8
4-SIS AIC : (51)R1C7 (18)R1C4 (89)R2C6 (95)R3C5 : => r1c5,r3c7<>5
BUG+1 : => r5c2=8
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Tue Aug 17, 2010 6:49 pm    Post subject: Reply with quote
My solver found: XY-Wing, Kite, killer XY-Chain, and BUG+1.

The last two steps can be replaced by a Kraken Cell.
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
PostPosted: Tue Aug 17, 2010 7:24 pm    Post subject: Reply with quote
While optimizing the solution, I inadvertently dropped the second move .... Embarassed
Danny, thanks for the checking.
Quote:
XY Wing : (85)R4C5 (59)R3C5 (98)R2C6 : => r1c5<>8
Kraken Swordfish : (8)C346/R258 + fin (8)r1c4 : => r8c5<>8
4-SIS AIC : (51)R1C7 (18)R1C4 (89)R2C6 (95)R3C5 : => r1c5,r3c7<>5
BUG+1 : => r5c2=8
JC
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Aug 23, 2010 1:31 am    Post subject: Reply with quote
Major struggle here. W-Wing, flightless M-Wing, implications of 59 UR really opened the door, followed by an XY-Wing and BUG+1.
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