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immpy

Joined: 06 May 2017
Posts: 571

Posted: Wed Oct 10, 2018 1:07 pm Post subject: Advanced 101018

Here is the puzzle I meant to post in my previous topic.
Enjoy everyone...

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp

ZeroAssoluto

Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy

Posted: Wed Oct 10, 2018 7:19 pm Post subject:

Hi everyone,

I chose to use the XY-Chain

Code:

+-----------+-----------+-----------+
| 6 9 7 | 8 1 2 | 3 5 4 |
| 1 2 5 | 4 3 7 | 9 8 6 |
| 4 8 3 | 6 9 5 | 1 7 2 |
+-----------+-----------+-----------+
| 7 6 248 | 12 45 18 | 25 9 3 |
| 3 5 248 | 29 47 89 | 6 1 78 |
| 89 1 289 | 3 57 6 | 257 4 578 |
+-----------+-----------+-----------+
| 59 3 6 | 179 8 19 | 4 2 157 |
| 2 7 1 | 5 6 4 | 8 3 9 |
| 589 4 89 | 179 2 3 | 57 6 157 |
+-----------+-----------+-----------+

Play this puzzle online at the Daily Sudoku site

1) r4c4-2-r4c7-5-r4c5-4-r5c5-7-r5c9-8-r5c6-9-r7c6 and -1 in r4c6,r79c4

Code:

+-----------+---------+-----------+
| 6 9 7 | 8 1 2 | 3 5 4 |
| 1 2 5 | 4 3 7 | 9 8 6 |
| 4 8 3 | 6 9 5 | 1 7 2 |
+-----------+---------+-----------+
| 7 6 24 | 1 45 8 | 25 9 3 |
| 3 5 48 | 2 47 9 | 6 1 78 |
| 89 1 289 | 3 57 6 | 257 4 578 |
+-----------+---------+-----------+
| 59 3 6 | 79 8 1 | 4 2 57 |
| 2 7 1 | 5 6 4 | 8 3 9 |
| 589 4 89 | 79 2 3 | 57 6 1 |
+-----------+---------+-----------+

Play this puzzle online at the Daily Sudoku site

2) r6c1-9-r7c1-5-r7c9-7-r5c9-8-r5c3-4-r4c3-2-r4c7-5-r9c7-7-r9c4-9-r9c3 and -8 inr56c3,r9c1

Ciao Gianni

Ajò Dimonios

Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

Posted: Thu Oct 11, 2018 5:48 pm Post subject:

Hi everyone.

Code:

+------------+-----------+-----------+
| 6 9 7 | 8 1 2 | 3 5 4 |
| 1 2 5 | 4 3 7 | 9 8 6 |
| 4 8 3 | 6 9 5 | 1 7 2 |
+------------+-----------+-----------+
| 7 6 248 | 12 45 18 | 25 9 3 |
| 3 5 248 | 29 47 89 | 6 1 78 |
| 89 1 289 | 3 57 6 | 257 4 578 |
+------------+-----------+-----------+
| 59 3 6 | 179 8 19 | 4 2 157 |
| 2 7 1 | 5 6 4 | 8 3 9 |
| 589 4 89 | 179 2 3 | 57 6 157 |
+------------+-----------+-----------+

Play this puzzle online at the Daily Sudoku site
One step after basics
If R4C7=2=>contradiction =>-2R4C7=>solution.
2R4C7-(2=1)R4C4-1R9C4;(2-5)R4C7=5R6C79-(5=7)R6C5-7R6C7=7R9C7-7R9C4 and 2R4C7-2R6C7=(2-9)R6C3=9R9C3-9R9C4=> R9C4=Ø=>-2R4C7=>stte
Ciao a Tutti
Paolo

immpy

Joined: 06 May 2017
Posts: 571

Posted: Sun Oct 14, 2018 7:51 am Post subject:

Elegant solutions guys! cheers...immp

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