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Set G Puzzle 7

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sat Dec 13, 2008 6:08 pm    Post subject: Set G Puzzle 7 Reply with quote

I took a break to fix an anomaly in my puzzle generator and to review how I choose puzzles to submit. (For those not forced to read USA government documents during their career, anomaly means bug.)

Anyway, I seem to be dragging my feet on addressing the anomaly, so I thought that I'd post again. Note: There isn't anything technically wrong with these puzzles. They just don't represent the logic that I'd intended.

This puzzle only needs VH techniques, but there's a twist that doesn't occur often. Unfortunately, the twist isn't necessary to solve the puzzle. Crying or Very sad

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

Play this puzzle online at the Daily Sudoku site
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Marty R.



Joined: 12 Feb 2006
Posts: 5161
Location: Rochester, NY, USA

PostPosted: Sat Dec 13, 2008 10:57 pm    Post subject: Reply with quote

Just a one-stepper and, unfortunately, no twists noted.

Quote:
W-Wing on 25
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Sat Dec 13, 2008 11:00 pm    Post subject: Reply with quote

I just played them as I saw them for six steps: x-wing, multi-coloring, kite, UR, and two xy-wings.

I did not look for the "twist", but may do so later ......

Again, a fun puzzle.

Ted Smile
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sun Dec 14, 2008 10:26 pm    Post subject: Reply with quote

After basics, there's a [c47] X-Wing in (5) that exposes an XY-Wing that cracks the puzzle.

The Twist: The first X-Wing also exposes a [c15] X-Wing in (5) that exposes two more XY-Wings, one of which cracks the puzzle.

I don't recall one X-Wing in a candidate immediately exposing a second X-Wing in that candidate. I'm sure it happens, but I suspect that it is rare.
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