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Set XY_03 Puzzle 029

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sat Jul 25, 2009 5:25 pm Post subject: Set XY_03 Puzzle 029

Code:

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

Play this puzzle online at the Daily Sudoku site

tlanglet

Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

Posted: Sun Jul 26, 2009 2:40 pm Post subject:

This puzzle was very difficult for me initially, but then I found the "key" and it fell soon thereafter.

Quote:

after basics, very few bivalue cells or other single digit moves.
a finned x-wing on 2 in r19c67, and then
an ER 9 with hinge in box9.
Then, after a lot of lost time looking for another move, I found a naked quad in box2! After some major cleanup, I finished the puzzle with
a xy-wing 23-5 with pivot in r1c7, and
a xy-wing 13-9 with pivot in r9c6 and pseudocell 19 in box2.

Time to go back to bed for a rest.

Ted

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