Search found 946 matches

by detuned
Fri 26 Nov, 2010 5:07 pm
Forum: Puzzle Competitions
Topic: LMI Contest 'Flip' 20-21 Nov
Replies: 31
Views: 14387

Re: LMI Contest 'Flip' 20-21 Nov

Nice - very interesting David! Thanks a lot. :)
by detuned
Fri 26 Nov, 2010 5:01 pm
Forum: Puzzle Links
Topic: croco-puzzle
Replies: 696
Views: 443707

Re: croco-puzzle

Well that's very odd...

My account seems to have been deleted. I'm no longer on the ratings list, and the time I registered earlier (1.45) for today's puzzle is marked "Anonym"

:shock:
by detuned
Fri 26 Nov, 2010 4:52 pm
Forum: General Puzzle Discussions
Topic: Anyone fancy testing some numberlink?
Replies: 12
Views: 10367

Re: Anyone fancy testing some numberlink?

Yeah, nick's found the problem. Basically, my proof assumed there was only one way round in which the 5 could go. I missed the bleeding obvious alternative route it could also have gone! The alternative version I posted closes up the gap, and now I'm certain it solves uniquely. Here is where some of...
by detuned
Fri 26 Nov, 2010 1:01 pm
Forum: General Puzzle Discussions
Topic: Anyone fancy testing some numberlink?
Replies: 12
Views: 10367

Re: Anyone fancy testing some numberlink?

#1 isn't unique! Turns out there's something of a cycle with which way round 3/4/5/6/7 go!
by detuned
Thu 25 Nov, 2010 11:38 am
Forum: General Puzzle Discussions
Topic: Anyone fancy testing some numberlink?
Replies: 12
Views: 10367

Re: Anyone fancy testing some numberlink?

OK - so I have a conjecture about uniqueness, which if turns out to be true guarantees that #2 is unique via some relatively easy checks. This is why #1 is interesting. It would fail some of these checks, but stills turns out to be unique... Edit: out of interest, what are people judging the difficu...
by detuned
Thu 25 Nov, 2010 12:30 am
Forum: General Puzzle Discussions
Topic: Anyone fancy testing some numberlink?
Replies: 12
Views: 10367

Anyone fancy testing some numberlink?

So I'm not used to using solving logic in numberlink, but I reckon I've proved the first is unique. Which is interesting as it has a few little quirks which I might previously have thought were barriers to uniqueness. The second is a much nicer puzzle - if it happens to solve uniquely. I'm fairly - ...
by detuned
Wed 24 Nov, 2010 9:41 pm
Forum: Puzzle Links
Topic: nikoli.com
Replies: 23
Views: 29028

Re: nikoli.com

All you'll ever need to know about solving numberlink Most of it requires meta-strategies. Like Palmer says, let the constructor deal with those painstaking details of ensuring the solution is unique. This is an interesting problem. I've traded a few useful remarks here and there with Thomas Snyder...
by detuned
Wed 24 Nov, 2010 8:35 pm
Forum: Puzzle (incl. Sudoku) Rules & Tips
Topic: (Classic) Sudoku
Replies: 9
Views: 19235

Re: (Classic) Sudoku

It strikes me that the original poster has a lot of power over the rules! Anyhow, I've updated to allow for different sized puzzles (seems sort of clunky to me, but it does the job). I've stuck with " a digit from 1 to 9 " rather than " one digit from 1 to 9 " as the former version is clearly non-pl...
by detuned
Tue 23 Nov, 2010 11:24 pm
Forum: Puzzle (incl. Sudoku) Rules & Tips
Topic: (Classic) Sudoku
Replies: 9
Views: 19235

(Classic) Sudoku

Let's get the ball rolling here. Based heavily on the nikoli wording: Place a number from 1 to 9 in each empty cell. (One number per cell.) Each row, column and 3x3 box (surrounded by bold outline) should contain each number from 1 to 9. Sudoku puzzles sometimes come in grids sized 6x6 (using the nu...
by detuned
Tue 23 Nov, 2010 2:00 pm
Forum: Puzzle Links
Topic: croco-puzzle
Replies: 696
Views: 443707

Re: croco-puzzle

Was mine one of the ridiculous times David 8-) ? I actually recall the Times journalist describing me as a hare to Nina's tortoise after winning their championship in 2009, and although that's probably hardly fair on Nina it does say something positive about hares ;) . Yesterday's was a tough puzzle...
by detuned
Tue 23 Nov, 2010 11:25 am
Forum: Puzzle Links
Topic: croco-puzzle
Replies: 696
Views: 443707

Re: croco-puzzle

I bodged the way the shaded cells went round the bottom left. Actually, the whole solve was something of a bodge job after misclicking somewhere without realising it. I'm highly surprised I managed to rescue it even to that extent!
by detuned
Tue 23 Nov, 2010 12:08 am
Forum: Puzzle Competitions
Topic: LMI Contest 'Flip' 20-21 Nov
Replies: 31
Views: 14387

Re: LMI Contest 'Flip' 20-21 Nov

David - as a point of interest speaking aas a fellow (part-time) puzzle constructor - I'd be interested to know what you thought were the pick of your set. Or at least what you were most proud of. No shortage of options there if you ask me :)
by detuned
Mon 22 Nov, 2010 1:14 pm
Forum: Puzzle Competitions
Topic: LMI Contest 'Flip' 20-21 Nov
Replies: 31
Views: 14387

Re: LMI Contest 'Flip' 20-21 Nov

David - I don't know whether this helps or not - but I certainly used it in the slitherlink and thought it was a beautiful bit of logic. Once you have identified the right axis, you know for a fact that you can't have any line segment on this axis, because it can't turn off both ways! This helped, i...
by detuned
Mon 22 Nov, 2010 12:35 pm
Forum: Puzzle Competitions
Topic: LMI Contest 'Flip' 20-21 Nov
Replies: 31
Views: 14387

Re: LMI Contest 'Flip' 20-21 Nov

Haven't looked the LMI forum yet today. The deal with flip strips was doing two sets of addition - one for the row sums, and one for the totals on the strips. You realise that there's a discrepancy of 1. If you do as I did, you think there's exactly one way to make the 26 using top/bottom combinatio...
by detuned
Sun 21 Nov, 2010 9:29 pm
Forum: Puzzle Competitions
Topic: LMI Contest 'Flip' 20-21 Nov
Replies: 31
Views: 14387

Re: LMI Contest 'Flip' 20-21 Nov

Fair enough, although I also think I haven't really given anything of any use away...
by detuned
Sun 21 Nov, 2010 9:24 pm
Forum: Puzzle Competitions
Topic: LMI Contest 'Flip' 20-21 Nov
Replies: 31
Views: 14387

Re: LMI Contest 'Flip' 20-21 Nov

David C introduced himself in the introductions forum Steve :roll: - but yeah primarily a Sudoku background. I think I saw a post from Roderick somewhere saying he saw our UKPA flyers from the Times championship in September - good news to see that someone actually bit! I think both have been partic...
by detuned
Sun 21 Nov, 2010 8:51 pm
Forum: Puzzle Competitions
Topic: LMI Contest 'Flip' 20-21 Nov
Replies: 31
Views: 14387

Re: LMI Contest 'Flip' 20-21 Nov

drsteve wrote:Interesting that it gives everyone's score to date. Thought it had gone badly, but that'll do nicely.

Fun puzzles, although a bit too much number crunching for my tastes in places.
Yeah, looks like a fairly strong all-round UK performance on this one so far!
by detuned
Sat 20 Nov, 2010 11:12 pm
Forum: Puzzle Competitions
Topic: LMI Contest 'Flip' 20-21 Nov
Replies: 31
Views: 14387

Re: LMI Contest 'Flip' 20-21 Nov

Fairly low participation on this one so far - I'd encourage everyone reading these boards to have a go - I'm sure finding a spare 50 minutes isn't too much to ask!
by detuned
Sat 20 Nov, 2010 8:18 pm
Forum: Puzzle Competitions
Topic: LMI Contest 'Flip' 20-21 Nov
Replies: 31
Views: 14387

Re: LMI Contest 'Flip' 20-21 Nov

An enjoyable set, it has to be said - I got answers for 9 out in time. I cranked out the slitherlink with about 20 seconds to spare, which was very nice. FLIP STRIPS was clever (even if I managed to solve for a permuted set of sums - d'oh :oops: ) and the mirror 0-2-5 was both novel and clever, and ...
by detuned
Thu 18 Nov, 2010 11:16 pm
Forum: Puzzle Links
Topic: croco-puzzle
Replies: 696
Views: 443707

Re: croco-puzzle

Yeah I've seen Tapa before and know the rough idea. It's just I wasn't 100% on the rules and wasted a little time double checking them. Good news with the latest puzzle (heyawake). Interface still a bit fiddly compared to nikoli, and I reckon I could've been a little quicker, but I'm currently scori...
by detuned
Thu 18 Nov, 2010 1:58 pm
Forum: Puzzle Links
Topic: nikoli.com
Replies: 23
Views: 29028

Re: nikoli.com

Nurikabe in particular is simply a case of using the beautiful interface to swiftly paint out paths the black squares take via strokes of the mouse, rather than individually clicking them. The faster you get at doing that encourages an intuition as to where islands/sea must go, without having to dou...
by detuned
Wed 17 Nov, 2010 9:13 pm
Forum: Puzzle Links
Topic: croco-puzzle
Replies: 696
Views: 443707

Re: croco-puzzle

Bleh. Just seen the anonymous puzzle is a day behind and so I had a go at said Masyu. The interface is absolutely godawful compared to nikoli.com (where you can just click and drag the loop as opposed to having to click every individual bloody element of the loop in about 3x the time). On the other ...
by detuned
Wed 17 Nov, 2010 3:56 pm
Forum: Puzzle Links
Topic: nikoli.com
Replies: 23
Views: 29028

Re: nikoli.com

I knew you could shift click to get the dots for yajilin - which is useful - but didn't know that re masyu. Frankly (much like shading ins/outs in slitherlink) I don't think you actually need to use these when solving. Viewing solutions can be somewhat useful - mostly though bemusing as to just how ...
by detuned
Wed 17 Nov, 2010 3:53 pm
Forum: Puzzle Links
Topic: croco-puzzle
Replies: 696
Views: 443707

Re: croco-puzzle

I registered last night, after reading Chris's excellent guide. I was lured into it by the fact the puzzle just before 11pm GMT was a Masyu - a type that I regularly feature near the very top on nikoli.com and I could make a good start on. Unfortunately by the time I'd signed up and everything it go...
by detuned
Mon 15 Nov, 2010 2:15 pm
Forum: Puzzle Competitions
Topic: LMI November Sudoku Contest (13-14 Nov 2010)
Replies: 17
Views: 11304

Re: LMI November Sudoku Contest (13-14 Nov 2010)

Ronald - there are many different flavours to irregular sudoku, and mileages can vary incredibly. I guess I found that I adapted to the Renban constraint very quickly - in most cases it's an extra region with an extra partition type of constraint that worked beautifully with sudoku. For example, if ...