dailysudoku.com

[molerboy]

Would anyone mind helping a newbie on a "Hard" puzzle. I've been doing easy/medium puzzles for months, and decided to try a hard one. I've gotten the puzzle as far as I can with the methods I've learned. Either I'm missing something in the methods I already know, or there's another method I need to learn to solve this puzzle. Can any help? If it's a method I need to learn, I'd be more interested in knowing what that is, then the actual solved puzzle.

Thanks

+-----------+------------+-----------+
| 8 9 6 | 5 1 3 | 7 2 4 |
| 2 1 7 | 9 8 4 | 6 3 5 |
| 4 3 5 | 26 7 26 | 1 8 9 |
+-----------+------------+-----------+
| 19 46 23 | 1236 5 9 | 8 49 7 |
| 19 456 23 | 7 36 8 | 23 459 16 |
| 7 56 8 | 1236 4 9 | 23 59 16 |
+-----------+------------+-----------+
| 5 8 14 | 46 2 7 | 9 16 3 |
| 6 2 49 | 34 39 1 | 5 7 8 |
| 3 7 19 | 8 69 5 | 4 16 2 |
+-----------+------------+-----------+

[Marty R.]

[molerboy]

I didn't know what a naked pair was, so I checked it out on some video demos. I see that naked pair in row 5 now, but I don't think the naked pair strategy helps me here (unless I still don't understand it well enough) because there's also a 23 in row 6 in F, and in row 4 in D. Can you explain any further?

[keith]

Molerboy,

What you have posted is invalid. There two <9>'s in C6.

In any event, for what you have posted, R3C6 must be <2> in C6, and R6C8 must be <9> in R6.

Also, the <23> pair in R5 means that R5C5 is not <3>.

Keith

[Marty R.]