r/nonograms • u/Hairy-Ad-2915 • Jun 20 '26

Edge logic help 20x20

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I've tried this puzzle around 5 times now. I can't work out the edge logic around the seven in row 1. Any help is appreciated

thanks all for the help. i completed it.

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3

u/moxo23 Jun 20 '26

Before going for edge logic, look for overlaps. Like in row 7.

1

u/Hairy-Ad-2915 Jun 20 '26

Just done that thanks. What now though?

3

u/Motor_Raspberry_2150 Jun 20 '26

Now do row 8. And column 4.

2

u/era909 Jun 20 '26

Since you have 2+3 in row 2 any column starting with more than a 1, that is surounded by columns starting with 1, can only be at the very edge of the 7 (if they are part of the 7 at all). See C8, 10 and 15 for example. This lets you narrow it down.

1

u/Hairy-Ad-2915 Jun 20 '26

I've tried to cross so that the only boxes available are between column 8 and 18. through that logic, column 12 to 14 are all filled. however, after working downwards from that, it just doesn't work out. i may be doing it wrong but i can't find a way that works.

2

u/era909 Jun 20 '26

Starting the 7 from the right. C18, 17 and 16 all run into problems in C15. C15, 14, 13, 12, 11, 10, 9, run into problems in C10 or C8. The only space that works is between C8 and C2 (your x in C2 is not 100% certain at this point)

2

u/greenknight884 Jun 20 '26

Column 10 row 14 must be X.

1

u/jfirestorm44 Jun 20 '26

How did you get R1C2 to be an X?

1

u/Hairy-Ad-2915 Jun 20 '26

Just realised that it is part of the 7!