View previous topic :: View next topic |
Author |
Message |
| MCondron
| Joined: 17 Jul 2006 | Posts: 35 | : | Location: Houston, TX | Items |
|
Posted: Thu Dec 21, 2006 1:15 am Post subject: When can multiple fins exist? |
|
|
I just want to make sure I have something right here regarding multiple fins. First, to be completely clear, by "multiple fins" I mean fins in more than one box, not "big fins", which is more than one fin in a single box.
It seems to me that multiple fins are NOT possible in "standard" (non-mutant) fish. They are only possible in mutant fish, right? What about franken-type configurations? |
|
Back to top |
|
|
| rkral
| Joined: 21 Oct 2005 | Posts: 233 | : | | Items |
|
Posted: Thu Dec 21, 2006 2:29 am Post subject: Re: When can multiple fins exist? |
|
|
MCondron wrote: | It seems to me that multiple fins are NOT possible in "standard" (non-mutant) fish. They are only possible in mutant fish, right? What about franken-type configurations? |
Good questions! Multiple fins -- fins that yield exclusions -- are not possible with basic fish defined only by rows and columns. Code: |
. / . | . / . | . / .
* X * | * X * | * X *
. / . | . / . | . / .
---------+----------+----------
. # . | . / . | . / .
** X ** | * X * | * X *
. # . | . / . | . / .
---------+----------+----------
. / . | . / . | . / .
* X * | * X * | * X *
. / . | . / . | . / .
finned swordfish |
Basic fish are NxN constraint sets -- N base rows with N covering columns (or N base columns with N covering rows). The rows and columns are orthogonal.
A fin cell (#) can only exist at a required empty cell (/) of the unfinned fish. An exclusion cell for a finned fish (**) can only occur at an exclusion cell of the unfinned fish (* and **).
An exclusion cell must "see" all the fin cells. Since rows and columns are orthogonal, an exclusion cell can only see fin cells within its own box.
Fin cells for finned franken and mutant fish can occur in multiple sectors. |
|
Back to top |
|
|
|