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28 August 2009 @ 03:03 am
Friday Puzzle #12 - Battleship Sudoku  
This August marks the 3rd anniversary of my creation of Battleship Sudoku, which also marks the start of my puzzle publishing career as it lead within a few weeks to a contract for my first book. Sterling actually approached me (they had a Hasbro deal to find appropriate titles for, and a Battleship Sudoku book made sense to them) and I jumped head-first into writing whole books of puzzles after having constructed just a handful of puzzles (~six total) to that point in my life.

I've decided to mark this occasion with a 3-themed Battleship Sudoku. All rows and columns that have a "3" battleship clue in this puzzle are marked; the missing clues are therefore not threes. This puzzle is on the harder side of those I've written and requires some "meta" strategies that are not present in either battleships or sudoku separately.

Rules: Place the digits 1 to 9 into each cell so that no digit repeats in any row, column, or 3x3 region. Also, place each of the given ships into the grid so that they do not touch, even diagonally, and so that each number outside the grid indicates the number of ship segments in that row/column. The numbers given in the sudoku grid cannot belong to any ship.

(Anonymous) on August 28th, 2009 10:28 am (UTC)
Hi Thomas

Is the 3 at the top row correct? Because I keep running into a contradiction. And if I ignore the top 3, it's a really nice solve. Or there is an extra size one battleship, with number 1 I am not aware of.
I could just be making a logic flaw, but I can't figure out what I'm doing wrong. It just struck me as peculiar that it solves so nicely without the top 3.
motris motris on August 28th, 2009 03:44 pm (UTC)
My apologies - that clue was errant and is now fixed in the puzzle.
(Anonymous) on August 28th, 2009 05:38 pm (UTC)
No problem. Nice puzzle though :)
Cazique cazique on August 28th, 2009 12:49 pm (UTC)
Even when I don't do them, merely the descriptions of your puzzles simply dazzle. Quick question for those of me new to Battleship Sudoku - I assume the multi-part ships can appear either forwards or backwards (1234 or 4321) or up or down, but not diagonally?
motris motris on August 28th, 2009 03:44 pm (UTC)
Yes, your understanding on this is correct. As in the game battleships your pieces will be vertical or horizontal. However, as ships can be rotated, you could have 1234 or 4321 going left to right or, if vertical 1234 or 4321 coming from top to bottom.
(Anonymous) on August 28th, 2009 06:10 pm (UTC)
What do the shaded circles represent?

motris motris on August 28th, 2009 06:27 pm (UTC)
As in most battleships puzzle, there are some ship clues inside of the grid. Here, the shaded circles represent 3 of the 4 submarines that you have to find. If you (or others) are confused about what an answer to one of these puzzles looks like, here is a sample.
Robert Hutchinson ertchin on August 30th, 2009 05:58 am (UTC)
Very nice.

Being able to play the two sets of restrictions (or 2.5, if you count "no 3s outside the grid that aren't already shown") off of each other seems to suit my strengths, as I never felt like I was stuck.

And since I've never said so before, I do intend to seek out some of your puzzle books shortly! I would've said this a few months ago, but I didn't have enough dollar signs to place in my finance grid, oh god that metaphor is horrible I should delete it.
(Anonymous) on September 7th, 2009 02:49 pm (UTC)
Love your puzzles - this one took a while, but loved the journey
Tom - sports fans (of which I include myself as well) have their heroes. As a puzzle fan, you are mine. Its that simple. Your puzzle and blog add to the joy of the distant relationship. We get to admire your star-quality and then listen into your head and them solve your own puzzles. Thanks for the dialogue and the relationship.

Here is the pat on one's own back portion of the post. How many people in the world could have created that puzzle? How many could have solved it. We are all a rare breed, and I hope we all appreciate the value of this puzzle community.


motris motris on September 7th, 2009 08:29 pm (UTC)
Re: Love your puzzles - this one took a while, but loved the journey
Thanks for this message; I feel there are many of us who share a common language in puzzles and, through my blog, I feel I am doing my best to help grow that community (or at least the connections therein). Its a really swell group to be a part of.
(Anonymous) on September 10th, 2010 04:23 am (UTC)
I think
This one is not so hard as you say,
but is much more fun than you said!

Were the normal battleship-set consisted of 9 ships....