Could someone post an in-depth explanation of how can 4-2 be beaten without guessing?

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lireas ♫

23 Nov, 2022 @ 8:49am

Could someone post an in-depth explanation of how can 4-2 be beaten without guessing?

My first attempt at it I gave up and guessed on one block, which made everything easier immediately. On my second and more dedicated attempt I was able to logically deduce most of the level until I got to the lower part, which I was not able to figure out at all. There must be a method I'm missing here

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Originally posted by JorgeJunior:

Just in case you haven't understood it yet.

Look at the {4} at the bottom. No matter where you start, A,B e C will always be blue. You see, A and B solves the {2}.

Suppose you want to start from the top.
Take the {3} on the left and the {2} on the right. No matter where you start, F and G will always be blue... and now you know that H can't be blue, otherwise there would be 5 blue cells around the {4}.

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2892513601

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Showing 1-3 of 3 comments

Berahlen

23 Nov, 2022 @ 4:35pm

Generally a lot of it comes down to either "what cells must be blue or black in any acceptable state" or "assume X cell is blue or black, work through what happens, look for contradiction (over/underloaded cell or diagonal)".

4-2 is mostly about realizing that those {x} cells will usually overlap some guaranteed territory no matter where they're oriented, and when those guaranteed blues touch other {y} cells they pin that segment too far from one edge to touch it so you get some black cells too.

Last edited by Berahlen; 23 Nov, 2022 @ 4:39pm

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JorgeJunior has Hexcells

23 Nov, 2022 @ 5:26pm

lireas ♫

23 Nov, 2022 @ 7:15pm

I am so sorry you guys but I ran a third attempt at understanding it without consulting any of your comments and I found what I missed the other times. Basically I failed to take into account the consecutive quality of the blue cells while thinking of the solution. Thanks either way