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Ajò Dimonios
Joined: 01 May 2017 Posts: 339 Location: Sassari Italy
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Posted: Mon May 22, 2017 2:49 pm Post subject: hard puzzle |
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Code: |
+-------+-------+-------+
| . . . | . . . | . . . |
| 7 6 2 | . . . | . . . |
| . 1 . | 3 8 . | . 2 . |
+-------+-------+-------+
| . 3 . | . 1 9 | 2 . . |
| 5 . 1 | . 6 . | 3 . 9 |
| . . 6 | 8 4 . | . 7 . |
+-------+-------+-------+
| . 7 . | . 5 4 | . 1 . |
| . . . | . . . | 5 6 2 |
| . . . | . . . | . . . |
+-------+-------+-------+
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JC Van Hay
Joined: 13 Jun 2010 Posts: 494 Location: Charleroi, Belgium
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Posted: Mon May 22, 2017 10:16 pm Post subject: |
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5L1C8 -> 0 solution; L1C8=9 and stte :
Code: | +------------------------+------------------+----------------+
| 3489 489(5) 34589 | 2467 27 2567 | 4679 (59) 1 |
| 7 6 2 | 14 9 15 | 48 35 38 |
| 49 1 459 | 3 8 567 | 4679 2 47 |
+------------------------+------------------+----------------+
| 48 3 7 | 5 1 9 | 2 48 6 |
| 5 48 1 | 27 6 27 | 3 48 9 |
| 29 29 6 | 8 4 3 | 1 7 5 |
+------------------------+------------------+----------------+
| 26 7 39 | 26 5 4 | 89 1 38 |
| 13489 489 3489 | 179 37 178 | 5 6 2 |
| 123689 89-2(5) 3589 | 1269 (23) 1268 | 47 (39) 47 |
+------------------------+------------------+----------------+
| [5r9c2=5r1c2-(5=9=3)r19c8-(3=2)r9c5]-2r9c2; 19 singles
Code: | +--------------+---------------+----------------+
| 3 589 589 | 24 7 256 | 469 -5(9) 1 |
| 7 6 2 | 4(1) 9 (15) | 48 3(5) 38 |
| 4 1 59 | 3 8 56 | 69 2 7 |
+--------------+---------------+----------------+
| 8 3 7 | 5 1 9 | 2 4 6 |
| 5 4 1 | 27 6 27 | 3 8 9 |
| 9 2 6 | 8 4 3 | 1 7 5 |
+--------------+---------------+----------------+
| 2 7 39 | 6 5 4 | 89 1 38 |
| 1 89 4 | 79 3 78 | 5 6 2 |
| 6 589 3589 | (19) 2 18 | 7 3(9) 4 |
+--------------+---------------+----------------+ | [9r1c8=9r9c8-(9=1)r9c4-1r2c4=(1-5)r2c6=5r2c8]-5r1c8; stte |
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Ajò Dimonios
Joined: 01 May 2017 Posts: 339 Location: Sassari Italy
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Posted: Tue May 23, 2017 10:00 pm Post subject: |
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Code: |
+---------------------+---------------------+----------------------+
| 3489 4589 34589 | 1245679 279 12567 | 146789 34589 1345678 |
| 7 6 2 | 1459 9 15 | 1489 34589 13458 |
| 49 1 459 | 3 8 567 | 4679 2 4567 |
+---------------------+---------------------+----------------------+
| 48 3 478 | 57 1 9 | 2 458 4568 |
| 5 248 1 | 27 6 27 | 3 48 9 |
| 29 29 6 | 8 4 235 | 1 7 15 |
+---------------------+---------------------+----------------------+
| 23689 7 389 | 269 5 4 | 89 1 38 |
| 13489 489 3489 | 179 379 1378 | 5 6 2 |
| 1234689 24589 34589 | 12679 2379 123678 | 4789 3489 3478 |
+---------------------+---------------------+----------------------+
|
Play this puzzle online at the Daily Sudoku site
if r1c2<>5 Code: |
+---------------------+---------------------+----------------------+
| 3489 489 34589 | 1245679 279 12567 | 146789 34589 1345678 |
| 7 6 2 | 1459 9 15 | 1489 34589 13458 |
| 49 1 459 | 3 8 567 | 4679 2 4567 |
+---------------------+---------------------+----------------------+
| 48 3 478 | 57 1 9 | 2 458 4568 |
| 5 248 1 | 27 6 27 | 3 48 9 |
| 29 29 6 | 8 4 235 | 1 7 15 |
+---------------------+---------------------+----------------------+
| 23689 7 389 | 269 5 4 | 89 1 38 |
| 13489 489 3489 | 179 379 1378 | 5 6 2 |
| 1234689 24589 34589 | 12679 2379 123678 | 4789 3489 3478 |
+---------------------+---------------------+----------------------+
|
Play this puzzle online at the Daily Sudoku site
Code: | +----------+---------+----------+
| 3 89 589 | 24 7 26 | 46 59 1 |
| 7 6 2 | 14 9 15 | 48 35 38 |
| 4 1 59 | 3 8 56 | 69 2 7 |
+----------+---------+----------+
| 8 3 7 | 5 1 9 | 2 4 6 |
| 5 4 1 | 27 6 27 | 3 8 9 |
| 9 2 6 | 8 4 3 | 1 7 5 |
+----------+---------+----------+
| 2 7 389 | 6 5 4 | 89 1 38 |
| 1 89 4 | 79 3 78 | 5 6 2 |
| 6 5 389 | 19 2 18 | 7 39 4 |
+----------+---------+----------+
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Ajò Dimonios
Joined: 01 May 2017 Posts: 339 Location: Sassari Italy
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Posted: Tue May 23, 2017 10:16 pm Post subject: |
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9 x-wing -->-9 r1c3,-9r9c3.
xy chains r1c7,r3c7,r7c7,r9c8,r9c4,r2c4,r2c7-->-4 r2c7-->contradiction r1c2 empty then r1c2=5-->solution.
Code: |
+--------+---------+-------+
| 3 . 58 | 2 7 6 | 4 9 1 |
| 7 6 2 | 4 9 1 | 8 5 3 |
| 4 1 9 | 3 8 5 | 6 2 7 |
+--------+---------+-------+
| 8 3 7 | 5 1 9 | 2 4 6 |
| 5 4 1 | 7 6 27 | 3 8 9 |
| 9 2 6 | 8 4 3 | 1 7 5 |
+--------+---------+-------+
| 2 7 3 | 6 5 4 | 9 1 8 |
| 1 8 4 | 79 3 7 | 5 6 2 |
| 6 5 9 | 1 2 8 | 7 3 4 |
+--------+---------+-------+
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Play this puzzle online at the Daily Sudoku site
r1c2=5-->solution basic strategies
Code: |
+--------------------+--------------------+---------------------+
| 3489 5 3489 | 124679 279 1267 | 146789 3489 134678 |
| 7 6 2 | 1459 9 15 | 1489 34589 13458 |
| 49 1 49 | 3 8 567 | 4679 2 4567 |
+--------------------+--------------------+---------------------+
| 48 3 478 | 57 1 9 | 2 458 4568 |
| 5 248 1 | 27 6 27 | 3 48 9 |
| 29 29 6 | 8 4 235 | 1 7 15 |
+--------------------+--------------------+---------------------+
| 23689 7 389 | 269 5 4 | 89 1 38 |
| 13489 489 3489 | 179 379 1378 | 5 6 2 |
| 1234689 2489 34589 | 12679 2379 123678 | 4789 3489 3478 |
+--------------------+--------------------+---------------------+
|
Play this puzzle online at the Daily Sudoku site
Code: |
+-------+-------+-------+
| 3 5 8 | 2 7 6 | 4 9 1 |
| 7 6 2 | 4 9 1 | 8 5 3 |
| 4 1 9 | 3 8 5 | 6 2 7 |
+-------+-------+-------+
| 8 3 7 | 5 1 9 | 2 4 6 |
| 5 4 1 | 7 6 2 | 3 8 9 |
| 9 2 6 | 8 4 3 | 1 7 5 |
+-------+-------+-------+
| 2 7 3 | 6 5 4 | 9 1 8 |
| 1 8 4 | 9 3 7 | 5 6 2 |
| 6 9 5 | 1 2 8 | 7 3 4 |
+-------+-------+-------+
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