Search found 194 matches

by nickdeller
Fri 10 Sep, 2010 7:21 pm
Forum: Puzzle Competitions
Topic: Logic Masters - Snakes
Replies: 14
Views: 5997

Re: Logic Masters - Snakes

Ok, Spoiler alert. You may not want to read this until you've had a go at the puzzles. Puzzle 7 "LM Domino Snake" I really really like the idea of this puzzle, that you have to make a domino chain. I looked at it thinking "ugh dominoes I always mess those up" and "ugh snakes" but this is a unique s...
by nickdeller
Fri 10 Sep, 2010 4:34 pm
Forum: General Puzzle Discussions
Topic: Pen or pencil? Trial and error?
Replies: 29
Views: 16906

Re: Pen or pencil? Trial and error?

I was familiar with the Battenburg rule but not the name. Can somebody give me a link to where this was first used? As far as I know, I coined it myself in this thread! I've genuinely never heard it called that before, but it's a memorable, obvious and easy shorthand for "2x2 checkerboard" so we mi...
by nickdeller
Fri 10 Sep, 2010 2:14 pm
Forum: General Puzzle Discussions
Topic: Pen or pencil? Trial and error?
Replies: 29
Views: 16906

Re: Pen or pencil? Trial and error?

I'm a propelling pencil man as well, but almost every possibility has its uses. If there are certainties in the early stages of a sudoku, there's nothing lost from inking them in and it saves a few seconds if you need to do some rubbing out later. I haven't got in the habit of printing multiple copi...
by nickdeller
Fri 10 Sep, 2010 2:02 pm
Forum: General Puzzle Discussions
Topic: Battleships
Replies: 10
Views: 6309

Re: Battleships

It's probably worth saying it in so many words - proving that a square contains water is potentially just as useful as proving that a square contains a ship, and sometimes it's the only way to make progress.
by nickdeller
Fri 10 Sep, 2010 1:10 pm
Forum: General Puzzle Discussions
Topic: Battleships
Replies: 10
Views: 6309

Re: Battleships

Yep, that's certainly where I was going to go next and is always useful. Another couple of little gimmes: . A . B . C 2 . D . If you get to a situation like this where you know that EITHER B or C is going to have to be a ship segment - then whichever it is, A and D are going to be diagonally touchin...
by nickdeller
Thu 09 Sep, 2010 12:30 pm
Forum: General Puzzle Discussions
Topic: Battleships
Replies: 10
Views: 6309

Battleships

OK, let's get a handy hints thread moving on how to solve standard Battleships puzzles, just in case anyone happens to search for "how to solve Battleships puzzles" and comes across us. :-) First a review of the rules: The fleet will usually be one four-square, two three-square, three two-square and...
by nickdeller
Mon 06 Sep, 2010 10:29 am
Forum: Puzzle Competitions
Topic: LMI September Puzzle Test - EverGreens II
Replies: 32
Views: 16672

Re: LMI September Puzzle Test - EverGreens II

PuzzleScot wrote:A better answer key might have been 'enter digits along the bottom row'!
I think that was one element of the answer key, wasn't it?
by nickdeller
Mon 06 Sep, 2010 10:18 am
Forum: Puzzle Competitions
Topic: LMI September Puzzle Test - EverGreens II
Replies: 32
Views: 16672

Re: LMI September Puzzle Test - EverGreens II

I found the Number Pyramid particularly annoying and lost a lot of time on that one puzzle. I don't know whether anyone else thinks I made a meal of it. Any suggestions on how best to tackle it? I won't walk through it at this stage, but I reckon the key points are: * remember that it's ALL DIFFERE...
by nickdeller
Sun 05 Sep, 2010 3:01 pm
Forum: Puzzle Competitions
Topic: LMI September Puzzle Test - EverGreens II
Replies: 32
Views: 16672

Re: LMI September Puzzle Test - EverGreens II

First time I've tried an LMI contest, definitely won't be the last! 265 is about my level, I think - 295 if I hadn't overlooked ONE empty square in the Masyu - d'oh! :-)
by nickdeller
Mon 30 Aug, 2010 6:28 pm
Forum: Announcements
Topic: WPC 2010 Team Selection
Replies: 10
Views: 7721

Re: WPC 2010 Team Selection

drsteve wrote:Out of curiousity, what was the best performance by a UK team/individual?
Looks like the targets are 19th for an individual (David McNeill, 2003 - 84 participated) and 12th for the team (McNeill 31st/Deller 43rd/Gardner 47th/O'Donnell 69th, 2004 - 90 individuals, 22 teams)
by nickdeller
Mon 23 Aug, 2010 2:46 pm
Forum: Puzzle Competitions
Topic: 2010 US Puzzle Championships
Replies: 94
Views: 41387

Re: 2010 US Puzzle Championships

GarethMoore wrote:...the message here to myself is to spend at least 30 seconds on each puzzle at the start and see what's what! ;)
I learned that lesson on my very first attempt in 2000, and have been forcibly retaught it every year since! :-)
by nickdeller
Sun 22 Aug, 2010 6:47 pm
Forum: Puzzle Competitions
Topic: 2010 US Puzzle Championships
Replies: 94
Views: 41387

Re: 2010 US Puzzle Championships

OK, I'm now cross with myself for not attempting Constant Sum, a very straightforward five-minute mechanical solve and definitely this year's wasted points. Got the Hex Masyu out this evening though and it's a nice way to spend an hour or so when the clock's not ticking!Mind you, I'm fond of ordinar...
by nickdeller
Sat 21 Aug, 2010 8:04 pm
Forum: Puzzle Competitions
Topic: 2010 US Puzzle Championships
Replies: 94
Views: 41387

Re: 2010 US Puzzle Championships

Not tried Constant Sum yet myself, it looks far too big! That might well be a (the) Sunday evening puzzle. :-)

Criss Cross Sums delighted me. It's a trick they keep pulling, and I'm never ready for it when they do. One simple insight, though, and... bangbangbangbangbang!
by nickdeller
Sat 21 Aug, 2010 7:56 pm
Forum: Puzzle Competitions
Topic: 2010 US Puzzle Championships
Replies: 94
Views: 41387

Re: 2010 US Puzzle Championships

Ah well, I've got the Sukoro out now as well. Nice enough puzzle, but a bit tedious; I'm starting to think that the phrase "All cells must be orthogonally connected" is the surest sign that I'm not going to find a puzzle type exciting :-)
by nickdeller
Sat 21 Aug, 2010 7:37 pm
Forum: Puzzle Competitions
Topic: 2010 US Puzzle Championships
Replies: 94
Views: 41387

Re: 2010 US Puzzle Championships

If it's any comfort, I'm only claiming 85! Couldn't even pick off a lot of the "easy" points, this time.
by nickdeller
Sat 21 Aug, 2010 7:33 pm
Forum: Puzzle Competitions
Topic: 2010 US Puzzle Championships
Replies: 94
Views: 41387

Re: 2010 US Puzzle Championships

Oh dear! I kept getting started and getting stuck! :-(

Feels like there's some really satisfying solves to be done here now the pressure's off. :-)
by nickdeller
Sat 21 Aug, 2010 1:28 am
Forum: General Puzzle Discussions
Topic: Skyscrapers
Replies: 3
Views: 3284

Re: Skyscrapers

By all means! I'll use the puzzle you linked. I'll number the rows from 1 to 6 top to bottom and columns A to F left to right for cell references. In general, you'll be wanting to place at least some of the highest scrapers first, so we'll start with six-scrapers. Consider Column F; the clue below m...
by nickdeller
Mon 09 Aug, 2010 4:01 pm
Forum: General Puzzle Discussions
Topic: Numberlink and Uniqueness
Replies: 13
Views: 10579

Re: Numberlink and Uniqueness

Thanks all! Realised soon after posting that the pattern below could similarly be slotted in anywhere (including as a trivial 3x3 puzzle grid) xxy w.y wzz I don't recall ever seeing an example in the wild with an unused square, I have to say, but it wouldn't surprise me if there's been one or two - ...
by nickdeller
Mon 09 Aug, 2010 12:34 pm
Forum: General Puzzle Discussions
Topic: Numberlink and Uniqueness
Replies: 13
Views: 10579

Numberlink and Uniqueness

I can't find an instant answer to this, so I wonder if anybody knows - is it demonstrably true or untrue to say that "For a Numberlink puzzle to have a unique solution, it MUST use all the cells in the grid"?