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DT Diabolical 031816

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sat Mar 19, 2016 5:52 pm    Post subject: DT Diabolical 031816 Reply with quote

And here is the Daily Telegraph's Diabolical from yesterday.
Code:
Puzzle: DT Diabolical 031816 #3496
+-------+-------+-------+
| 9 . . | . . . | . . . |
| 7 4 1 | . . . | 5 . . |
| 5 . . | 7 . . | . 2 . |
+-------+-------+-------+
| . . . | 2 . 6 | . . . |
| . 9 3 | . . . | 6 4 . |
| . . . | 4 . 1 | . . . |
+-------+-------+-------+
| 6 1 . | . . 5 | . . 9 |
| . . 5 | . . . | 7 1 . |
| 4 . . | . . . | . . 3 |
+-------+-------+-------+
Keith
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sat Mar 19, 2016 6:14 pm    Post subject: Reply with quote

Spoiler ahead:

My after basics:
Code:
+-------------+-------------+-------------+
| 9   23  28  | 158 158 4   | 13  6   7   |
| 7   4   1   | 69  26  239 | 5   39  8   |
| 5   36  68  | 7   18  39  | 139 2   4   |
+-------------+-------------+-------------+
| 18  57  4   | 2   39  6   | 389 379 15  |
| 12  9   3   | 58  578 78  | 6   4   12  |
| 28  567 67  | 4   39  1   | 389 379 25  |
+-------------+-------------+-------------+
| 6   1   27  | 3   27  5   | 4   8   9   |
| 3   28  5   | 89  4   29  | 7   1   6   |
| 4   78  9   | 16  16  78  | 2   5   3   |
+-------------+-------------+-------------+
It's a slog to get even there!

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sun Mar 20, 2016 2:01 am    Post subject: Reply with quote

I used Keith's basics.

DP (58) r15c45

Using a mix of internals and externals

8r3c5=7r5c5=> 7 common outcomes

(Sorry, no notation).
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Sun Mar 20, 2016 2:32 am    Post subject: Reply with quote

Darn it all Marty! You make it look so easy! This one took me a long long long time and I began with Keith's grid.
9r2c4-r2c8=(9-1)r3c7=r3c5-(1=6)r9c5-(6=2)r2c5-(2=39)r23c6-9r2c4; contradiction => r2c4<>9; stte (I think).
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sun Mar 20, 2016 3:32 am    Post subject: Reply with quote

dongrave wrote:
Darn it all Marty! You make it look so easy! This one took me a long long long time and I began with Keith's grid.
9r2c4-r2c8=(9-1)r3c7=r3c5-(1=6)r9c5-(6=2)r2c5-(2=39)r23c6-9r2c4; contradiction => r2c4<>9; stte (I think).


Don, I took the liberty of offering up an alternative, changes in red.

(6=9)r2c4-r2c8=(9-1)r3c7=r3c5-(1=6)r9c5-(6=2)r2c5-(2=396)r23c6r2c4
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

PostPosted: Sun Mar 20, 2016 8:01 am    Post subject: Reply with quote

A shorter version of the previous chains :
Code:
+-------------+-----------------+-----------------+
| 9   23   28 | 158   158   4   | 13     6     7  |
| 7   4    1  | (69)  2-6   239 | 5      3(9)  8  |
| 5   36   68 | 7     8(1)  39  | 3(19)  2     4  |
+-------------+-----------------+-----------------+
| 18  57   4  | 2     39    6   | 389    379   15 |
| 12  9    3  | 58    578   78  | 6      4     12 |
| 28  567  67 | 4     39    1   | 389    379   25 |
+-------------+-----------------+-----------------+
| 6   1    27 | 3     27    5   | 4      8     9  |
| 3   28   5  | 89    4     29  | 7      1     6  |
| 4   78   9  | 1-6   (16)  78  | 2      5     3  |
+-------------+-----------------+-----------------+
(6=9)r2c4-9r2c8=(9-1)r3c7=1r3c5-(1=6)r9c5 -> -6r2c5,r9c4; stte
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Sun Mar 20, 2016 2:05 pm    Post subject: Reply with quote

Oh! Cool! I like it! Thanks Marty and JC!
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