View previous topic :: View next topic |
Author |
Message |
immpy
Joined: 06 May 2017 Posts: 571
|
Posted: Fri Mar 10, 2023 5:09 pm Post subject: VH++ 031023 |
|
|
Hello all, enjoy the puzzle.
Code: |
+-------+-------+-------+
| 2 . 5 | . 6 . | . 3 9 |
| . . . | 1 7 . | 2 . 4 |
| . . . | 3 . . | . . . |
+-------+-------+-------+
| 4 . 7 | 5 . . | 3 . 1 |
| . 3 . | . . . | 8 . . |
| 8 . 1 | 9 . . | . . 6 |
+-------+-------+-------+
| . . . | 8 . . | . . . |
| . . . | . 1 . | 9 . 2 |
| 1 . 9 | . 5 . | . 6 8 |
+-------+-------+-------+
|
Play this puzzle online at the Daily Sudoku site
cheers...immp |
|
Back to top |
|
|
TomC
Joined: 30 Oct 2020 Posts: 358 Location: Wales
|
Posted: Tue Mar 21, 2023 10:36 am Post subject: |
|
|
Code: |
+--------------------+------------------+------------------+
| 2 17 5 | 4 6 8 | 17 3 9 |
| 369 689 368 | 1 7 59 | 2 58 4 |
| f79 14789 48 | 3 29 259 | 6 1578 e57 |
+--------------------+------------------+------------------+
| 4 269 7 | 5 8 26 | 3 29 1 |
| g569 3 b26 | c267 a24 1 | 8 x24579 d57 |
| 8 25 1 | 9 3 247 | 457 2457 6 |
+--------------------+------------------+------------------+
| 567 24567 246 | 8 249 24679 | 1457 1457 3 |
| 3567 45678 3468 | 67 1 467 | 9 457 2 |
| 1 247 9 | 27 5 3 | 47 6 8 |
+--------------------+------------------+------------------+
|
Play this puzzle online at the Daily Sudoku site
First step remove <4> from r5c8 leaving r5c5 = 4
if x=4 follow the chain a2 b6 c7 d5 e7 f9 g6 > leads to no <9> in row 5 or
if x=4 follow the chain g9 f7 e5 d7 bc26 a4 > leads to two <4>'s in row 5
Then Skyscraper on <2> in r57c3 and r59c4 removes <2> from r9c1
Then 67-2 XY wing in r5c34, r6c6 removes <2> from r6c2 to solve |
|
Back to top |
|
|
dongrave
Joined: 06 Mar 2014 Posts: 568
|
Posted: Tue Mar 21, 2023 4:48 pm Post subject: |
|
|
I 'm glad that Tom posted a solution. Somehow I missed that immp had posted this one! After basics:
Code: | +-------------------+----------------+------------------+
| 2 17 5 | 4 6 8 | c17 3 9 |
| 369 689 368 | 1 7 59 | 2 58 4 |
| 79 148 48 | 3 29 259 | 6 18 b57 |
+-------------------+----------------+------------------+
| 4 269 7 | 5 8 26 | 3 29 1 |
| 569 3 g26 | h267 24 1 | 8 24579 a57* |
| 8 f25 1 | 9 3 247 | e457 2457 6 |
+-------------------+----------------+------------------+
| 567 24567 246 | 8 249 24679 | 1457 1457 3 |
| 3567 45678 3468 | 67 1 467 | 9 457 2 |
| 1 j247 9 | i27 5 3 | d47 6 8 |
+-------------------+----------------+------------------+
|
Then I used the following chain: 7*r5c9-r3c9=r1c7-(7=4)r9c7-(47=5)r6c7-(5=2)r6c2-(2=6)r5c3-(67*=2)r5c4-r9c4=r9c2 contradiction (i.e. 2r69c2) => r5c9 <> 7; stte. |
|
Back to top |
|
|
Clement
Joined: 24 Apr 2006 Posts: 1111 Location: Dar es Salaam Tanzania
|
Posted: Sun Apr 02, 2023 4:20 pm Post subject: VH ++ 031023 |
|
|
Two steps Code: |
+----------------------+-------------------+-------------------+
| 2 b17 5 | 4 6 8 |c17 3 9 |
| 369 689 368 | 1 7 59 | 2 58 4 |
|a79 14789 48 | 3 29 259 | 6 1578 57 |
+----------------------+-------------------+-------------------+
| 4 269 7 | 5 8 26 | 3 29 1 |
|g56-9 3 26 | 267 24 1 | 8 24579 57 |
| 8 f25 1 | 9 3 247 |e457 2457 6 |
+----------------------+-------------------+-------------------+
| 567 24567 246 | 8 249 24679 |d1457 1457 3 |
| 3567 45678 3468 | 67 1 467 | 9 457 2 |
| 1 247 9 | 27 5 3 | 47 6 8 |
+----------------------+-------------------+-------------------+
|
Step 1: (9=7)r3c1 - (7=1)r1c2 - r1c7 = (1-5)r7c7 = r6c7 - r6c2 = (5)r5c1 => - 9r5c1
Code: |
+---------------------+------------------+--------------------+
| 2 17 5 | 4 6 8 | 17 3 9 |
| 369 68 368 | 1 7 59 | 2 58 4 |
| 79 1478 48 | 3 29 259 | 6 1578 57 |
+---------------------+------------------+--------------------+
| 4 9 7 | 5 8 6 | 3 2 1 |
| 56 3 d26 |c27 4 1 | 8 9 57 |
| 8 5-2 1 | 9 3 27 | 457 457 6 |
+---------------------+------------------+--------------------+
| 567 24567 246 | 8 29 2479 | 1457 1457 3 |
| 357 4578 348 | 6 1 47 | 9 457 2 |
| 1 a247 9 |b27 5 3 | 47 6 8 |
+---------------------+------------------+--------------------+
|
Step 2: (2)r9c2 = r9c4 - r5c4 = (2)r5c3 => - 2r6c2; stte |
|
Back to top |
|
|
|