What are the technics to use

AlanLudo · Posted: Tue Apr 13, 2010 4:33 pm Post subject: What are the technics to use

Actually, most of the puzzle can be solved with pretty basic technics.
I personally dont go beyond quad.
I have never used swordfish or X-wing
But how to recognise such pattern?

Alan

strmckr · Posted: Wed Apr 14, 2010 10:52 pm Post subject:

AlanLudo · Posted: Thu Apr 15, 2010 12:32 am Post subject:

Yep, that was actually something I noticed as the solver I developed is using quads as theist difficult solving technic and so far none of the puzzle I found on news paper or so have been insolvable by my engine.

I didn't precisely get what you wanted to say about the swordfish pattern recognition ?

Cheers,

Alan

strmckr · Posted: Thu Apr 15, 2010 1:35 am Post subject:

here it is for x-wings, the same idea is for NxN fish constraints.

two rows / columns where there is only 4 digits.

the digits of N form a rectangle shape.

where each digit see one digit on the opposite row.

the eliminations occur in opposite direction to where the digits line up.

( if its two rows. eliminate on columns,
if its two columns eliminate on rows)

to understand how the elimination works

try placing a N on the board, the opposite corner is always true.

thus no matter which way the rectangle solves the x's are never true

champagne · Posted: Fri Apr 16, 2010 11:45 am Post subject:

strmckr · Posted: Sat Apr 17, 2010 1:18 am Post subject:

champagne · Posted: Sat Apr 17, 2010 4:46 am Post subject:

strmckr · Posted: Mon Apr 19, 2010 12:20 am Post subject:

no i didn't post my findings:

the most i've done with the monster puzzles is identify interesting virus type patterns

here by Allan confirmed there existence with his program (i've only done it to a few of the monsters)

i'll see if i can remember exactly what i used in solving and post it

{i lost a lot of my work on a reformat after my computer was hacked}

cheers
strmckr.