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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Mon Jul 05, 2010 4:02 am Post subject: |
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| keith wrote: | If A and B are two mutually exclusive (complementary) choices.
Forcing: A choice of A or B forces a result C in another cell. Therefore, C is true.
Pincers: A choice of A forces C in a cell, @. A choice of B forces C in a different cell, #. @ # are pincers; any cell that sees both cannot be C.
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A forcing chain has two or more streams that lead to a common conclusion. This conclusion can be either an assignment or an elimination. A pincer is a forcing chain with two streams.
Just because someone wants to claim that the streams started from a recognized pattern doesn't change how the final elimination was obtained! |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Mon Jul 05, 2010 5:54 am Post subject: |
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the UR posted in the original post can also be categorized as a UR type 3. right?
it can't, however, be categorized as a UR type 1 or a UR type 2.
and like Marty said, it can be categorized as a UR type 4 if more information was present. |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Mon Jul 05, 2010 2:23 pm Post subject: |
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| keith wrote: | If A and B are two mutually exclusive (complementary) choices.
Forcing: A choice of A or B forces a result C in another cell. Therefore, C is true.
Pincers: A choice of A forces C in a cell, @. A choice of B forces C in a different cell, #. @ # are pincers; any cell that sees both cannot be C.
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So a forcing chain (or network) results only in placements? Wow, that's news to me.  |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Mon Jul 05, 2010 3:04 pm Post subject: |
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| ronk wrote: | | keith wrote: | If A and B are two mutually exclusive (complementary) choices.
Forcing: A choice of A or B forces a result C in another cell. Therefore, C is true.
Pincers: A choice of A forces C in a cell, @. A choice of B forces C in a different cell, #. @ # are pincers; any cell that sees both cannot be C.
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So a forcing chain (or network) results only in placements? Wow, that's news to me. |
By "forces a result" I meant any conclusion, including an elimination. Sloppy language.
Keith |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Tue Jul 06, 2010 10:07 am Post subject: |
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| daj95376 wrote: |
A forcing chain has two or more streams that lead to a common conclusion. This conclusion can be either an assignment or an elimination. A pincer is a forcing chain with two streams.
Just because someone wants to claim that the streams started from a recognized pattern doesn't change how the final elimination was obtained! |
Indeed and amen to Keith's point on the philosophy. |
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