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Ajò Dimonios
Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
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 Posted: Thu Aug 10, 2017 11:11 am Post subject: very hard V |
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Hi everyone
| Code: |
+-------+-------+-------+
| 6 8 . | 1 . . | . . . |
| . . 3 | . 2 . | . . . |
| 9 . . | 3 . 6 | . . . |
+-------+-------+-------+
| 8 . . | . . 1 | . . 7 |
| . 1 . | 7 6 2 | . 3 . |
| 3 . . | 4 . . | . . 6 |
+-------+-------+-------+
| . . . | 6 . 7 | . . 8 |
| . . . | . 8 . | 4 . . |
| . . . | . . 3 | . 5 9 |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
Ciao a Tutti
Paolo |
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Ajò Dimonios
Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
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| Posted: Thu Aug 10, 2017 2:21 pm Post subject: |
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Hi everyone
| Code: |
+-----------------+------------+------------------+
| 6 8 2457 | 1 579 459 | 2579 2479 3 |
| 1457 457 3 | 8 2 459 | 15679 14679 145 |
| 9 2457 12457 | 3 57 6 | 1257 8 1245 |
+-----------------+------------+------------------+
| 8 2456 2456 | 59 3 1 | 259 249 7 |
| 45 1 9 | 7 6 2 | 8 3 45 |
| 3 257 257 | 4 59 8 | 1259 129 6 |
+-----------------+------------+------------------+
| 1245 9 1245 | 6 14 7 | 3 12 8 |
| 127 3 1267 | 59 8 59 | 4 67 12 |
| 147 467 8 | 2 14 3 | 67 5 9 |
+-----------------+------------+------------------+
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Play this puzzle online at the Daily Sudoku site
-2R78C3 (locked candidates)
IF R7C1=1=> singles to the contradiction =>-1R7C1
IF R7C3=1=> singles to the contradiction=>-1R7C3
IF R8C9=1=> singles to the contradiction=>-1R8C9
IF R8C4=9=>single to the contradiction=>-9R8C4=>locked candidates and singles to the end.
Ciao a Tutti
Paolo |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Thu Aug 10, 2017 4:01 pm Post subject: |
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8 singles
Exclusions by the solutions of the 2s, 4s
Exclusions by the solutions of B9, R8; 4 singles
6r2c7 -> 0 solution via the exclusions by the solutions of the 9s, C8 and the 1s; 5 singles
| Code: | +-----------------------+----------------+-----------------------+
| 6 8 2457 | 1 57(9) 459 | 257(9) 2479 3 |
| 5(17) 457 3 | 8 2 459 | 57-6(19) 14679 145 |
| 9 2457 2457(1) | 3 57 6 | 257(1) 8 1245 |
+-----------------------+----------------+-----------------------+
| 8 2456 2456 | 59 3 1 | 25(9) 249 7 |
| (45) 1 9 | 7 6 2 | 8 3 45 |
| 3 (257) (257) | 4 5(9) 8 | 25(19) (129) 6 |
+-----------------------+----------------+-----------------------+
| 1245 9 145 | 6 14 7 | 3 (12) 8 |
| (127) 3 67(1) | 59 8 59 | 4 67 (12) |
| (147) 7(46) 8 | 2 (14) 3 | 7(6) 5 9 |
+-----------------------+----------------+-----------------------+
6r9c7 6r9c2
|2r6c2 7r6c2 5r6c2 |
|2r6c3 7r6c3 5r6c3 |
| 5r5c1 4r5c1 |
4r9c2| 4r9c1 4r9c5 |
| 1r9c5 1r9c1 |
| 1r8c13 1r8c9|
|2r7c8 1r7c8|
9r2c7 |9r6c5 9r1c5|
|9r46c7 9r1c7|
2r6c8 9r6c8 1r6c8
1r7c8 2r7c8
1r2c7 1r6c7 1r3c7
1r3c3 1r2c1
7r9c1 7r2c1 7r8c1
2r8c9 2r8c1 -> 6r9c7==9r2c7==1r2c7 => -6r2c7; 5 singles
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1r8c9 -> 0 solution via the exclusions by the solutions of the 9s; 10 singles | Code: | +-----------------------+------------------+----------------------+
| 6 8 2457 | 1 57(9) 459 | 2579 (249) 3 |
| 157 47(5) 3 | 8 2 459 | 1579 6 (145) |
| 9 7(245) 1257(4) | 3 57 6 | 1257 8 15(24) |
+-----------------------+------------------+----------------------+
| 8 6 (245) | (59) 3 1 | 259 (249) 7 |
| 45 1 9 | 7 6 2 | 8 3 45 |
| 3 7(25) 257 | 4 5(9) 8 | 125-9 (129) 6 |
+-----------------------+------------------+----------------------+
| 1245 9 145 | 6 14 7 | 3 (12) 8 |
| 12 3 6 | 59 8 59 | 4 7 -1(2) |
| 147 47 8 | 2 14 3 | 6 5 9 |
+-----------------------+------------------+----------------------+
1r8c9
2r8c9 2r3c9
2r3c2 2r6c2
1r7c8 1r6c8
9r6c8|9r4c8 9r1c8|
|9r6c5 9r1c5|
9r4c4 5r4c4
2r4c3 5r4c3 4r4c3
4r3c9 4r3c3 4r3c2
5r6c2 5r3c2 5r2c2
4r4c8 4r1c8
1r2c9 5r2c9 4r2c9 -> 9r6c5==9r45c8 and 2r8c9==1r7c8==1r2c9 => -9r6c7 and -1r8c9; 10 singles |
Exclusions by the solutions of the 4s, 7s and the 2s; stte |
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Ajò Dimonios
Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
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| Posted: Fri Aug 11, 2017 10:02 pm Post subject: |
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Hi everyone
A simple consideration iF R3C9=5 or R4C8=2 or R4C3=4 or R4C7=5 or R6C8=9 You can get the solution using only the basic technique. To prove the falsehood of the other candidates in each cell, the basic technique is not enough.
Ciao a Tutti
Paolo |
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