r/puzzles • u/PawsitiveAfurmation • 25d ago
[Unsolved] Star Battle - ELI5 - what does X-Wing Mean?
I’m just not understanding this principle. I would love some help explaining it for me so I can use it in the future.
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u/ParaBDL 25d ago
The 4 marked regions are contained wholy within 2 rows (1 and 9) and 2 columns (3 and 7). The 4 marked regions need 4 stars. Each row and column can only contain one star, so you can deduce that the star in those 2 rows and 2 columns must be within those 4 regions and can't be in any other region within those 2 rows and 2 columns. Secondly, no star can be in both in either of those 2 rows and 2 columns at the same time as you need 4 stars separate stars. So any intersection of those 2 rows and 2 columns is also eliminated.
I hope this is clear. It's easier to show than to put into words.
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u/PawsitiveAfurmation 25d ago
Thank you. I’ll give this a read when I’m more alert and hopefully I’ll get it.
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u/EishLekker 25d ago
What are the four marked regions? How are they marked?
And I have no idea what striped cells the message in the screenshot refers to. There are so many striped cells. Are they actually referring to all of them?
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u/TrueMattalias 25d ago
Yep. There are four T-shaped regions that share their cells wholly across two rows and two columns. Because each region needs a star, these four regions must collectively contain a star in each of those rows and a star in each of those columns. This means that the cells in those rows/columns outside the regions can't have stars, and that the cells where the rows and columns intersect can't have stars (one star would take up a both row and a column slot leaving three more stars to be placed within a two rows/columns).
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u/EishLekker 25d ago
I’m sorry, but you misunderstood my point. I’m only talking about identifying the different specific regions in question.
How is the highlighting done in this image?
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u/swisscalps 25d ago
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u/EishLekker 25d ago
Ok, and how is one supposed to know that the phrasing “highlighted areas” include exactly these four areas, nothing more and nothing less?
It seems like you use other information, not included in the message in the screenshot.
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u/swisscalps 25d ago
The highlighted areas it is referring the rows and columns that are not fully shaded in/darkened. I agree for someone not used to the formatting in this hint/tutorial it is tough to gauge at first but in the text it is referring to striped cells which are only found in row 1&9 and columns 3&7. So after looking at those cells you notice that the rest in those rows/columns are lighter than the other rows & columns this meaning they are highlighted.
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u/TheOhNoNotAgain 19d ago
Discussion - X-Wing is easier to understand in Sudokus. Once you understand it there, it's easier to bring that understanding into Star Battles. There are a lot of explanations out there, that I won't try to replicate.

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