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immpy
Joined: 06 May 2017
Posts: 571
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 Posted: Sat Oct 30, 2021 5:14 pm Post subject: Extreme 103021 |
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Hello all, enjoy the puzzle...
| Code: |
+-------+-------+-------+
| . . 8 | . . 1 | . . 7 |
| 3 . 4 | . . . | . . 8 |
| . . . | . 8 . | . . . |
+-------+-------+-------+
| . 2 . | 4 . 3 | 1 . . |
| . 3 . | 5 . 2 | . 8 . |
| . . 6 | 8 1 7 | . 9 . |
+-------+-------+-------+
| . . . | . 2 . | . . . |
| 9 . . | . . . | 8 . 3 |
| 1 . . | 6 . . | 9 . . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
cheers...immp |
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dongrave
Joined: 06 Mar 2014
Posts: 568
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| Posted: Sat Oct 30, 2021 11:48 pm Post subject: |
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Thanks for the puzzle Immp! I enjoyed that.
After basics:
| Code: | +---------------+--------------+-------------+
| 256 569 8 | 29 34 1 | 256 34 7 |
| 3 679 4 | 279 5 69 | 26 1 8 |
| 256 1 57 | 237 8 46 | 256 34 9 |
+---------------+--------------+-------------+
| 8 2 9 | 4 6 3 | 1 7 5 |
| 7 3 1 | 5 9 2 | 4 8 6 |
| 45 45 6 | 8 1 7 | 3 9 2 |
+---------------+--------------+-------------+
| 456 4568 35 | 39 2 4589 | 7 56 1 |
| 9 4567 257 | 1 47 45 | 8 256 3 |
| 1 578 2357 | 6 37 58 | 9 25 4 |
+---------------+--------------+-------------+
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And then I used the following chain: 3r3c4=r1c5-(3=7*)r9c5-(7=4)r8c5-(4=5)r8c6-(5=8)r9c6-(7*8=5)r9c2-(5=3)r7c3 => r7c4 <> 3; stte. |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Sun Oct 31, 2021 10:18 pm Post subject: Slightly different |
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Thanks Immp.
I got to the same result as dongrave but used a different route.
(3=5)r7c3-(5=6)r7c8-(56=4)r7c1-(456=8)r7c2-(58=7)r9c2-(7=3)r9c5-(3)r7c4
When you plug a 3 into r7c3 then obviously=> r7c4 < > 3.
However, plug a 5 into r7c3 and also r7c4 < > 3.
Having 5 in r7c3 also means no 3's in row 7 when using the above chain so we know that r7c3 can not be 5.
(forgive me if I have not used the asterisk marker system!) |
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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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| Posted: Tue Nov 02, 2021 6:13 pm Post subject: Extreme 103021 |
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Opted for two steps | Code: |
+-----------------------+----------------------+-------------------+
| 256 569 8 |b29 34 1 | 256 34 7 |
| 3 c679 4 |b279 5 69 | 26 1 8 |
| 256 1 d7-5 | 237 8 46 | 256 34 9 |
+-----------------------+----------------------+-------------------+
| 8 2 9 | 4 6 3 | 1 7 5 |
| 7 3 1 | 5 9 2 | 4 8 6 |
| 45 45 6 | 8 1 7 | 3 9 2 |
+-----------------------+----------------------+-------------------+
| 456 4568 a35 |b39 2 4589 | 7 56 1 |
| 9 4567 257 | 1 47 45 | 8 256 3 |
| 1 578 2357 | 6 37 58 | 9 25 4 |
+-----------------------+----------------------+-------------------+
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Step 1: (5=3)r7c3 – (3=927)r712c4 – (7)r2c2 = (7)r3c3 => - 5r3c3
| Code: |
+-----------------------+----------------------+--------------------+
| 256 569 8 | 29 34 1 | 56 34 7 |
| 3 c69 4 | 7 5 b69 | 2 1 8 |
| 256 1 7 | 23 8 a46 | 56 34 9 |
+-----------------------+----------------------+--------------------+
| 8 2 9 | 4 6 3 | 1 7 5 |
| 7 3 1 | 5 9 2 | 4 8 6 |
| 45 45 6 | 8 1 7 | 3 9 2 |
+-----------------------+----------------------+--------------------+
| 456 468 35 | 39 2 4589 | 7 56 1 |
| 9 d467 25 | 1 d47 5-4 | 8 256 3 |
| 1 78 235 | 6 37 58 | 9 25 4 |
+-----------------------+----------------------+--------------------+
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Step 2: (4=6)r3c6 – (6=9)r2c6 – (9=6)r2c2 – (6=7|4)r8c25 => - 4r8c6; stte |
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glesco
Joined: 12 May 2022
Posts: 36
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| Posted: Thu Oct 13, 2022 7:04 pm Post subject: |
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I used an xy-wing to eliminate 2s from r2c4, r1c7
Then an xy-chain anchored at r3c3 & r2c4 to eliminate 7 at r3c4 |
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