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immpy
Joined: 06 May 2017
Posts: 571
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 Posted: Thu Apr 26, 2018 1:26 pm Post subject: Tough Bugger (too hard) 042618 |
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Darn near gave up on this one, almost stumped me. Fortunately I kept wrangling and managed to solve.....hope all enjoy it.
| Code: |
+-------+-------+-------+
| . 3 9 | . . 5 | 7 . . |
| 2 . . | 3 . . | . . . |
| . . 7 | . . . | . . 6 |
+-------+-------+-------+
| 8 . . | . 1 7 | 5 . . |
| . . 2 | . 3 . | 8 . . |
| . . 5 | 8 4 . | . . 7 |
+-------+-------+-------+
| 4 . . | . . . | 1 . . |
| . . . | . . 4 | . . 8 |
| . . 6 | 2 . . | 4 9 . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
cheers...immpy |
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Ajò Dimonios
Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
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| Posted: Thu Apr 26, 2018 10:50 pm Post subject: |
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Hi everyone
| Code: |
+-----------------+----------------+-----------------+
| 16 3 9 | 146 268 5 | 7 1248 124 |
| 2 14568 148 | 3 7 168 | 9 1458 145 |
| 15 1458 7 | 149 289 189 | 23 123458 6 |
+-----------------+----------------+-----------------+
| 8 46 34 | 69 1 7 | 5 2346 2349 |
| 167 1467 2 | 5 3 69 | 8 146 149 |
| 1369 169 5 | 8 4 2 | 36 136 7 |
+-----------------+----------------+-----------------+
| 4 2589 38 | 679 5689 3689 | 1 23567 235 |
| 1359 1259 13 | 1679 569 4 | 236 23567 8 |
| 1357 1578 6 | 2 58 138 | 4 9 35 |
+-----------------+----------------+-----------------+
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Play this puzzle online at the Daily Sudoku site
Solution in one step
6R2C2=>contradiction (R5C1=Ø)=>-6R2C2=>solution.
Classic solution in two steps
Empty rectangle of 6 in box 5 with 6 of line 2 (AIC=> 6R2C2=6R2C6-6R5C5=6R4C4-6R4C2)=>-6R4C2
| Code: |
+-----------+------------+-------------+
| 16 3 9 | 14 26 5 | 7 8 24 |
| 2 68 4 | 3 7 68 | 9 15 15 |
| 15 158 7 | 14 29 89 | 23 234 6 |
+-----------+------------+-------------+
| 8 4 3 | 69 1 7 | 5 26 29 |
| 167 167 2 | 5 3 69 | 8 146 149 |
| 9 16 5 | 8 4 2 | 36 136 7 |
+-----------+------------+-------------+
| 4 29 8 | 679 569 3 | 1 2567 25 |
| 3 29 1 | 679 569 4 | 26 2567 8 |
| 57 57 6 | 2 8 1 | 4 9 3 |
+-----------+------------+-------------+
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Play this puzzle online at the Daily Sudoku site
[6R2C2-6R2C6=6R5C6-(6=9)R4C4 and 6R2C2-6R56C2=6R5C1-(6=9)R5C6]=>contradiction (two 9 in box 5)=>-6R2C2=>Stte.
Ciao a Tutti Paolo |
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immpy
Joined: 06 May 2017
Posts: 571
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| Posted: Wed May 02, 2018 4:47 am Post subject: |
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From the first grid I played a Sashimi X-Wing (1) c34 r28 finr1c4 finr3c4=>r2c6<>1. Followed this with a Turbot Fish (6) r2c26 r4c4,r5c6. Thus, r4c2<>6. That resulted in the second grid, where I used a 2-String Kite (6) r1c1, r5c6 (connected in b2 @r1c5, r2c6). Hence, r5c1<>6. stte
cheers, immp |
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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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| Posted: Thu May 03, 2018 6:30 pm Post subject: Tough Bugger (too hard) 042618 |
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Two Alternating Inference Chains | Code: |
+-------------------------+--------------------------+-------------------------+
| a16 3 9 |b146 b268 5 | 7 1248 124 |
| 2 g14568 h48-1| 3 7 c168 | 9 1458 145 |
| 15 g1458 7 | 149 289 189 | 23 123458 6 |
+-------------------------+--------------------------+-------------------------+
| 8 f46 34 | e69 1 7 | 5 2346 2349 |
| 167 1467 2 | 5 3 d69 | 8 146 149 |
| 1369 169 5 | 8 4 2 | 36 136 7 |
+-------------------------+--------------------------+-------------------------+
| 4 2589 38 | 679 5689 3689 | 1 23567 235 |
| 1359 1259 13 | 1679 569 4 | 236 23567 8 |
| 1357 1578 6 | 2 58 138 | 4 9 35 |
+-------------------------+--------------------------+-------------------------+
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(1): (1=6)r1c1 - r1c45 = r2c6 - r5c6 = r4c4 - (6=4)r4c2 - r23c2 = (4)r2c3 => - 1r2c3 followed by
| Code: |
+---------------------+---------------------+----------------------+
|e16 3 9 |f14 a26 5 | 7 8 g4-2 |
| 2 68 4 | 3 7 b68 | 9 15 15 |
| 15 158 7 | 14 29 89 | 23 234 6 |
+---------------------+---------------------+----------------------+
| 8 46 3 | 69 1 7 | 5 246 249 |
|d167 1467 2 | 5 3 c69 | 8 146 149 |
| 9 16 5 | 8 4 2 | 36 136 7 |
+---------------------+---------------------+----------------------+
| 4 29 8 | 679 569 3 | 1 2567 25 |
| 3 29 1 | 679 569 4 | 26 2567 8 |
| 57 57 6 | 2 8 1 | 4 9 3 |
+---------------------+---------------------+----------------------+
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(2): (2=6)r1c5 - r2c6 = r5c6 - r5c1 = (6-1)r1c1 = (1-4)r1c4 = (4)r1c9 => - 2r1c9; stte |
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