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Puzzle 10/07/18: XY

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sun Jul 18, 2010 3:28 am Post subject: Puzzle 10/07/18: XY

Code:

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

Play this puzzle online at the Daily Sudoku site

Code:

after basics
+--------------------------------------------------------------+
| 579 579 4 | 3 56 2 | 1 8 569 |
| 12 8 12 | 4 56 9 | 7 3 56 |
| 6 359 359 | 7 8 1 | 2 4 59 |
|--------------------+--------------------+--------------------|
| 4 2 137 | 5 37 6 | 9 17 8 |
| 179 379 8 | 2 37 4 | 5 6 137 |
| 57 6 357 | 1 9 8 | 4 2 37 |
|--------------------+--------------------+--------------------|
| 3 4 27 | 6 12 5 | 8 9 17 |
| 8 1 6 | 9 4 7 | 3 5 2 |
| 2579 579 2579 | 8 12 3 | 6 17 4 |
+--------------------------------------------------------------+
# 44 eliminations remain

tlanglet

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

Posted: Sun Jul 18, 2010 1:13 pm Post subject:

First pass of four steps...........

Quote:

Type 1 UR (56)r12c59; r1c9<>56

AXY-wing 1-37 vertex(17)r4c8, pincers (13)r4c3 & (37)r6c9 with fin (7)r4c3
If xy-wing is true: r6c3<>3
If fin is true: (7)r4c3-r7c3=r7c9-(7=3)r6c9; r6c3<>3

(9=2)r9c1-(2=7)r7c3-r7c9=r5c9-(7=3)r5c5-(3=9)r5c2-r3c2=(9)r3c3; r9c3<>9

BUG+1 forces r9c3=2

Or a one stepper.......

Quote:

Flightless xy-wing -127 with vertex (27)r7c3 plus transport (1)r2c3-r4c3=(1)r4c8; r5c9<>1

Ted

peterj

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

Posted: Sun Jul 18, 2010 2:58 pm Post subject:

Another m-wing+ ...

Quote:

m-wing(12) pseudo-cell(12) (1=7)r7c9-(7=2)r7c3 - r2c3=(2-1)r2c1=r5c1; r5c9<>1

[Edit. Same elimination as Ted's, similar cells different pattern...]

Marty R.

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

Posted: Mon Jul 19, 2010 4:49 pm Post subject:

Type 1 UR (56) Coloring (7) DP 57-59-79, r9c1<>2 due to invalidity

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