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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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 Posted: Wed Jan 14, 2009 10:49 pm Post subject: vanhegan VH 1/14 |
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| Code: | 5 . .|1 . .|. . 2
. . 6|. . 2|1 . .
1 . .|. . 6|. . .
-----+-----+-----
. 8 5|2 . .|9 . .
. 1 .|. 4 .|. 6 .
. . 9|. . 3|2 8 .
-----+-----+-----
. . .|8 . .|. . 6
. . 1|7 . .|5 . .
7 . .|. . 9|. . 4 |
this is one of those days in the vanhegan life where the VH was more difficult, seemingly, than the fiendish (which is solvable with one skyscraper).
anyone else try this one? |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Wed Jan 14, 2009 11:20 pm Post subject: |
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Sudoku Susser:
8 x Comprehensive Forcing Chains
4 x Simple Forcing Chains
1 x XY-Wing
1 x Swordfish
3 x Intersection Removal
1 x Simple Naked Sets
14 x Pinned Squares
Only about three of the chains are reasonable: Extended XY-wings, etc.
Keith |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Jan 15, 2009 12:48 am Post subject: |
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| keith wrote: | Sudoku Susser:
8 x Comprehensive Forcing Chains
4 x Simple Forcing Chains
1 x XY-Wing
1 x Swordfish
3 x Intersection Removal
1 x Simple Naked Sets
14 x Pinned Squares
Only about three of the chains are reasonable: Extended XY-wings, etc.
Keith |
whoa! |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Jan 15, 2009 12:58 am Post subject: |
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| Code: | .------------------.------------------.------------------.
| 5 349 348 | 1 389 7 | 6 39 2 |
| 39 379 6 | 4 3589 2 | 1 3579 3789 |
| 1 2379 2378 | 35 3589 6 | 4 3579 3789 |
:------------------+------------------+------------------:
| 36 8 5 | 2 67 1 | 9 4 37 |
| 23 1 237 | 9 4 8 | 37 6 5 |
| 46 47 9 | 56 567 3 | 2 8 1 |
:------------------+------------------+------------------:
| 2349 2349 234 | 8 123 5 | 37 1237 6 |
| 8 6 1 | 7 23 4 | 5 239 39 |
| 7 5 23 | 36 1236 9 | 8 123 4 |
'------------------'------------------'------------------' |
ok, so coloring on 3 removes 3 from r7c1 and the adjoining w-wing on {3,9} removes the 9 from r2c9
doesn't help much, but from first glance that is what was available.
then on 7... r4c9 = r5c7 - r5c3 = r6c2 - r23c2 = r3c3; r3c9 <> 7 |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Thu Jan 15, 2009 1:27 am Post subject: |
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A 4-cell chain 35 - 56 - 67 - 37 takes out <3> in R3C9.
A W-wing <39> takes out <9> in R2C9.
An extended XY-wing 37 -37 -37 - 67 - 36 takes out <3> in R7C1.
Skyscraper takes out <7> in R3C9.
| Code: | +----------------+----------------+----------------+
| 5 349 348 | 1 389 7 | 6 39 2 |
| 39 379 6 | 4 3589 2 | 1 3579 378 |
| 1 2379 2378 | 35 3589 6 | 4 3579 89 |
+----------------+----------------+----------------+
| 36 8 5 | 2 67 1 | 9 4 37 |
| 23 1 237 | 9 4 8 | 37 6 5 |
| 46 47 9 | 56 567 3 | 2 8 1 |
+----------------+----------------+----------------+
| 249 2349 234 | 8 123 5 | 37 1237 6 |
| 8 6 1 | 7 23 4 | 5 239 39 |
| 7 5 23 | 36 1236 9 | 8 123 4 |
+----------------+----------------+----------------+ |
Your move.
Keith
Last edited by keith on Thu Jan 15, 2009 1:33 am; edited 1 time in total |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Jan 15, 2009 1:32 am Post subject: |
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sorry keith I guess we weren't simulcasting 
this is your grid and has a coloring move on 7, that eliminates 7 from r3c9
| Code: | +----------------+----------------+----------------+
| 5 349 348 | 1 389 7 | 6 39 2 |
| 39 379 6 | 4 3589 2 | 1 3579 378 |
| 1 2379 2378 | 35 3589 6 | 4 3579 789 |
+----------------+----------------+----------------+
| 36 8 5 | 2 67 1 | 9 4 37 |
| 23 1 237 | 9 4 8 | 37 6 5 |
| 46 47 9 | 56 567 3 | 2 8 1 |
+----------------+----------------+----------------+
| 249 2349 234 | 8 123 5 | 37 1237 6 |
| 8 6 1 | 7 23 4 | 5 239 39 |
| 7 5 23 | 36 1236 9 | 8 123 4 |
+----------------+----------------+----------------+ |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Thu Jan 15, 2009 1:47 am Post subject: |
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| storm_norm wrote: | sorry keith I guess we weren't simulcasting
this is your grid and has a coloring move on 7, that eliminates 7 from r3c9
| Code: | +----------------+----------------+----------------+
| 5 349 348 | 1 389 7 | 6 39 2 |
| 39 379 6 | 4 3589 2 | 1 3579 378 |
| 1 2379 2378 | 35 3589 6 | 4 3579 789 |
+----------------+----------------+----------------+
| 36 8 5 | 2 67 1 | 9 4 37 |
| 23 1 237 | 9 4 8 | 37 6 5 |
| 46 47 9 | 56 567 3 | 2 8 1 |
+----------------+----------------+----------------+
| 249 2349 234 | 8 123 5 | 37 1237 6 |
| 8 6 1 | 7 23 4 | 5 239 39 |
| 7 5 23 | 36 1236 9 | 8 123 4 |
+----------------+----------------+----------------+ |
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Right, which I edited in my previous message, and is pointed out in your other message. Now, what?
(Time to look for those things we used to use and forgot: Like, finned XY-wings.)
Keith |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Jan 15, 2009 1:54 am Post subject: |
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| Code: | +----------------+----------------+----------------+
| 5 349 348 | 1 389 7 | 6 39 2 |
| 39 379 6 | 4 3589 2 | 1 3579 378 |
| 1 2379 2378 | 35 3589 6 | 4 3579 89 |
+----------------+----------------+----------------+
| 36 8 5 | 2 67 1 | 9 4 37 |
| 23 1 237 | 9 4 8 | 37 6 5 |
| 46 47 9 | 56 567 3 | 2 8 1 |
+----------------+----------------+----------------+
| 249 2349 234 | 8 123 5 | 37 1237 6 |
| 8 6 1 | 7 23 4 | 5 239 39 |
| 7 5 23 | 36 1236 9 | 8 123 4 |
+----------------+----------------+----------------+ |
so this is where we are, I Like to look for w-wings or m-wings that can be extended, or maybe mix them up a bit. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Jan 15, 2009 1:59 am Post subject: |
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| Code: | +----------------+----------------+----------------+
| 5 *34-9 *348 | 1 389 7 | 6 39 2 |
|*39 379 6 | 4 3589 2 | 1 3579 378 |
| 1 2379*2378 | 35 3589 6 | 4 3579*89 |
+----------------+----------------+----------------+
|*36 8 5 | 2 67 1 | 9 4 *37 |
| 23 1 237 | 9 4 8 | 37 6 5 |
| 46 47 9 | 56 567 3 | 2 8 1 |
+----------------+----------------+----------------+
| 249 2349 234 | 8 123 5 | 37 1237 6 |
| 8 6 1 | 7 23 4 | 5 239 *39 |
| 7 5 23 | 36 1236 9 | 8 123 4 |
+----------------+----------------+----------------+ |
for example that w-wing {3,9} can be extended via the 8 in r3c9.
8 true r3c9,
8 not true r3c3
8 true r1c3
4 not true r1c3
4 true r1c2, means that 9 is eliminated from r1c2.
because either the 9 is true in r2c1 or the 4 is true in r1c2 either way the 9 in r1c2 is not true. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Thu Jan 15, 2009 2:37 am Post subject: |
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Four-Stepper: Empty Rectangle, 2x XY-Chain, and XYZ-Wing.
[Edit: replaced suggestion with a solution.]
Last edited by daj95376 on Thu Jan 15, 2009 11:28 am; edited 1 time in total |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Thu Jan 15, 2009 6:30 am Post subject: |
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| Code: | +----------------+----------------+----------------+
| 5 *34 *3-48 | 1 389 7 | 6 *39 2 |
| 39 379 6 | 4 3589 2 | 1 3579 378 |
| 1 2379*2378 | 35 3589 6 | 4 3579*89 |
+----------------+----------------+----------------+
| 36 8 5 | 2 67 1 | 9 4 37 |
| 23 1 237 | 9 4 8 | 37 6 5 |
| 46 47 9 | 56 567 3 | 2 8 1 |
+----------------+----------------+----------------+
| 249 2349 234 | 8 123 5 | 37 1237 6 |
| 8 6 1 | 7 23 4 | 5 239 39 |
| 7 5 23 | 36 1236 9 | 8 123 4 |
+----------------+----------------+----------------+ |
from my last posted position, this nifty chain finishes it.
(4=3)r1c2 - (3=9)r1c8 - (9=8)r3c9 - (8)r3c1 = (8)r1c3; r1c3 <> 4
basically it says that either the 4 in r1c2 is true or if not true, follow the chain around and the 8 in r1c3 is true. in either case, the 4 in r1c3 can't exist. |
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