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Puzzle 10/10/31: A10 Advanced

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sat Oct 30, 2010 5:29 pm Post subject: Puzzle 10/10/31: A10 Advanced

I'm hanging up my hat on posting puzzles. Today's puzzles are the last.

Code:

+-----------------------+
| 2 . . | . 5 . | . 4 . |
| . 3 . | . . . | . . 2 |
| . . 1 | . 3 2 | 8 . 5 |
|-------+-------+-------|
| . . . | 3 . 5 | 4 . . |
| 4 . 3 | . . . | 5 8 . |
| . . 5 | 4 . . | . 2 1 |
|-------+-------+-------|
| . . 2 | 1 7 . | 9 3 . |
| 3 . . | . 4 6 | 2 . 8 |
| . 8 4 | . . 3 | . 5 6 |
+-----------------------+

Play this puzzle online at the Daily Sudoku site

Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Tue Nov 02, 2010 1:22 am Post subject:

I had fun with this. After a DP 68-78-67 in boxes 123 forced r8c8=1, I was left with:

Code:

+----------+------------+----------+
| 2 79 68 | 789 5 179 | 16 4 3 |
| 5 3 68 | 789 19 4 | 16 79 2 |
| 79 4 1 | 6 3 2 | 8 79 5 |
+----------+------------+----------+
| 8 12 79 | 3 12 5 | 4 6 79 |
| 4 12 3 | 279 6 179 | 5 8 79 |
| 79 6 5 | 4 8 79 | 3 2 1 |
+----------+------------+----------+
| 6 5 2 | 1 7 8 | 9 3 4 |
| 3 79 79 | 5 4 6 | 2 1 8 |
| 1 8 4 | 29 29 3 | 7 5 6 |
+----------+------------+----------+

Play this puzzle online at the Daily Sudoku site

Via trial and error I came up with a 14-cell potential DP on 79.

Code:

+----------+-----------+---------+
| . 79 . | . . 179 | . . . |
| . . . | 789 . . | . 79 . |
| 79 . . | . . . | . 79 . |
+----------+-----------+---------+
| . . 79 | . . . | . . 79 |
| . . . | 279 . . | . . 79 |
| 79 . . | . . 79 | . . . |
+----------+-----------+---------+
| . . . | . . . | . . . |
| . 79 79 | . . . | . . . |
| . . . | . . . | . . . |
+----------+-----------+---------+

Play this puzzle online at the Daily Sudoku site

Either r1c6=1, r2c4=8 or r5c4=2. From these three possibilities r9c4=9 is forced and the puzzle is done.

Maybe there was a pattern with fewer cells, but once I found one that worked I stopped looking.

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