motris ([info]motris) wrote,
@ 2008-03-14 02:12:00
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!irakAkari!
Continuing my four-week series of new puzzle types leading up to the release of Battleship Sudoku, with week one being the introduction of Color Sudoku as a fun new sudoku variant, here is week two: irakAkari.

I loves me some nikoli puzzles but have rarely tried to tweak any of their non-sudoku types until now. Akari (rules for Akari) is a "puzzle" that works much better online than on paper, but suffers I feel from most often being too easy. The 10x10 puzzles on Nikoli.com feel a lot like a sudoku might if you get 72 givens - you basically just have to do a couple obvious things like click all four squares around a "4" and then you are done. They become speed races for that 5-6 second solution, and while the larger puzzles can have more interesting chaining at times, it seems Akari could be made much more interesting with some small changes. Certainly, going to a non-square board might improve the puzzle as hexagonal grids offer a lot more potential for block-to-block communication in the puzzle. I leave this construction as an exercise to the reader for now. However, I've wondered in the square puzzle if a method to extend viewing zones from vertical/horizontal lines into lines that bend could be interesting.

Thematically, if the puzzle is about placing guards in a museum so that they collectively "see" every square but see no other guards, imagine the museum now is made entirely of mirrors. This means in most directions the guards will see themselves (still allowed), but if there are diagonal walls, then the viewing zone will extend in a new direction allowing a guard to see another guard around a corner, which is not allowed. In this variation, all squares, including squares containing a diagonal mirror, are still seen. However, guards CANNOT occupy a square with a diagonal mirror, so these spots must all be viewed from elsewhere. Numbers on black squares, as always, represent the number of guards immediately adjacent to that square.

The example should give you a feel for how a solution could look. I've then given 3 puzzles that are maybe medium in difficulty, and definitely harder as small puzzles than regular Akari, that hopefully show off the potentials for interesting logical deductions with this small change.


irakAkari example:







Puzzle 1 (Breezy)






Puzzle 2 (Gusts up to 25 mph)






Puzzle 3 (Storm warning)



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Interesting
[info]stigant
2008-03-14 08:12 pm UTC (link)
They definitely add a couple of new techniques/ideas to the basic Akari formula, and not just the trivial difference of having to peer around a corner to see what will be lit up. There's deeper thinking here. And yeah, Akari works better on a computer. Keeping track of what's lit, what not lit, what's a light, what's a non-light etc etc is tough by hand. I felt like there was quite a bit more "What if this is a light..." reasoning in your puzzles. Which is something that the Nikoli puzzles try to avoid, and may explain some of the easiness of those puzzles. Although that may be at least partly due to the newness of the puzzle - some of the basic theorems haven't been developed yet, so the lines of reasoning seem to be deeper because you're not using shortcuts.

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[info]garethmoore
2008-03-14 11:35 pm UTC (link)
I enjoyed these and agree they're much more fun than standard akari puzzles. I started by lightly drawing in all lines that passed through the diagonal squares and then with these markings ready-made found they solved pretty much the same as existing puzzles, albeit with a bit more complexity keeping track of what was going on.

I must be unusual but I prefer solving the regular ones on paper, since I tend to solve most of them by spotting areas where either one or another square must be lighting up a row/column and then marking in the illuminated squares without knowing the actual precise light source square - and you can't make that sort of marking in the nikoli online player (or others). Using this technique solved all of the above puzzles, but they were still much more interesting to solve than the majority of standard ones.

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[info]sheehan
2008-04-22 03:09 am UTC (link)
I get two answers for #1. (http://img148.imageshack.us/my.php?image=irakakari1ur3.png).

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[info]motris
2008-04-22 03:15 am UTC (link)
In your pink solution, you do not hit the single cell in row 4, column 6 (just touching the 0. Having to fill that cell forces the green solution

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[info]motris
2008-04-22 03:17 am UTC (link)
actually, your green solution is incorrect too as it doesn't fill row 3, column 6. Figure out how to light both of those cells in one answer and you will have it solved.

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[info]sheehan
2008-04-22 03:28 am UTC (link)
Ah, thanks. I blame MSPaint :(. (Was reusing fill-yellow as my "not a bulb" and "illuminated" marker).

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