dailysudoku.com

I'm missing some point of logic here, Keith. Above you said this:

+-------------+-------------+-------------+
| 249 7 8 | 369 5 39 | 46 1 29 |
| 5 239 239 | 68 4 1 | 68 27 279 |
...

That was helpful, George. Thanks. It is based not only on numerical possibilities, it also indicates some of the logic involved. I think I can use a little more work on my logic, and my "seeing." I'm ...

George, I would he interested in your notation system.
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Keith, I don't understand unique rectangles. I see the ones that you pointed out, although the cells have other values, too, and similar valu ...

These discussions and examples are very helpful to be, as a beginner. I did April 30 puzzle four times, so I missed yesterday. The first three crashed. Finally, I did a forced chain thing and broke it ...

Oh yeah, why did I see those. You're right, they unlock a lot. Many thanks.

So, I think I understand some of the more advanced techniques like Swordfish and X-wing, but certainly those shouldn't be necessary on a puzzle rated "easy." I got stuck. I looked for hidden everythin ...

I'm a newbie, too. What I have learned about naked singles in that you need to keep checking, as you add more numbers to the puzzle. When I am stuck, I go through each cell and look for what numbers a ...

If the puzzle indeed has a unique solution, you can use that knowledge to help solve the puzzle. About once a week I run into this situation. There is a rectangle formed by four values, across several ...

OK, I finally did this puzzle on the third try. But I still guessed. The first time I guessed wrong, so I chose the other possibility and it worked out. The AARP website now has a daily sudoku puzzle, ...

I spent more than three hours doing April 22 twice, and both times I screwed up. I think maybe there is a better use for my time. I tried a new theory. When there were two choices, say, 2 and 7, I d ...