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This is the hardest I've found. I have not solved it.

It may not be clear that cell (9,4) is given as 4.

The puzzle turns on whether 84x is 7-2-6 or 7-3-4, and I've run into dead ends both ways.

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Posted (edited) · Report post

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Don't worry about the combinations for 84x or 840x. Just note that the positions of 7 are pretty much fixed for rows 2/3/4.
After doing some preliminary entries that are straight forward, eliminate 2+8 as choice for 10+ in row 1; Then eliminate choices for 6789 simultaneously in columns 5 and 6; You will notice that only one possible combination of 6789 in last 2 rows of column 6 gives you possible solution; with any other combination there are conflicts elsewhere.
Then the grid opens up and you have an easy solution.

Edited by DeGe
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Posted · Report post

Nice.

I actually stayed up last night and got it.

I got the 7s in rows 234 ok.

I attacked row 1 by trying stuff for cells 7 and 8.

Once I made the right guess and CORRECTLY looking at the

consequences, the 1289 cells opened up as you said.

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