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Extreme 021320

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immpy

Joined: 06 May 2017
Posts: 571

Posted: Thu Feb 13, 2020 8:51 am Post subject: Extreme 021320

Hello all, enjoy the puzzle...

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp

Clement

Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

Posted: Fri Feb 28, 2020 7:13 am Post subject: Extreme 021320

I opted for Three Steps

Code:

+-------------------+--------------------+--------------------------+
| 7 16 5 | 349 8 f39 | 2 1469 f19 |
| 9 c68 c48 | 2 7 1 | 3458 3468 b358 |
| 2 3 d148 | 459 45 6 |e1489 e1489 7 |
+-------------------+--------------------+--------------------------+
| 1 58 3 | 7 59 4 | 89 2 6 |
|h58 9 6 | 135 2 g35 | 178 178 4 |
| 4 2 7 | 6 19 8 | 139 5 139 |
+-------------------+--------------------+--------------------------+
| 3 4 189 | 159 6 7 | 1589 189 2 |
| 6 157 19 | 8 145 2 | 134579 13479 1359 |
| 5-8 1578 2 | 1459 3 59 | 6 14789 a1589 |
+-------------------+--------------------+--------------------------+

Step 1: (8)r9c9 = r2c9 - r2c23 = (8-1)r3c3 = r3c78 - (1=93)r1c96 - (3=5)r5c6 - (5=8)r5c1 => - 8r9c1

Code:

+-----------------+-----------------+--------------------------+
| 7 16 5 | b49 8 3 | 2 1469 a19 |
| 9 68 48 | 2 7 1 | 345 3468 358 |
| 2 3 148 | 459 45 6 | 149 1489 7 |
+-----------------+-----------------+--------------------------+
| 1 5 3 | 7 9 4 | 8 2 6 |
| 8 9 6 | 3 2 5 | 17 17 4 |
| 4 2 7 | 6 1 8 | 39 5 39 |
+-----------------+-----------------+--------------------------+
| 3 4 189 | 15 6 7 | 159 189 2 |
| 6 17 19 | 8 45 2 | 134579 13479 1359 |
| 5 178 2 | c14 3 9 | 6 1478 8-1 |
+-----------------+-----------------+--------------------------+

Step 2: XY-Wing (1=9)r1c9 - (9=4)r1c4 - (4=1) => - 1r9c9

Code:

+----------------+-------------------+---------------------+
| 7 6 5 | c49 8 3 | 2 149 b19 |
| 9 8 4 | 2 7 1 | 35 6 35 |
| 2 3 1 | d459 e45 6 | 49 8 7 |
+----------------+-------------------+---------------------+
| 1 5 3 | 7 9 4 | 8 2 6 |
| 8 9 6 | 3 2 5 | 17 17 4 |
| 4 2 7 | 6 1 8 | 39 5 39 |
+----------------+-------------------+---------------------+
| 3 4 8 | 15 6 7 | 159 19 2 |
| 6 17 9 | 8 4-5 2 | 47 3 a15 |
| 5 17 2 | 14 3 9 | 6 47 8 |
+----------------+-------------------+---------------------+

Step 3 : (5=1)r8c9 - (1=9)r1c9 - r1c4 = (9-5)r3c4 = (5)r3c5 => - 5r8c5; stte

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