First off let me say hello!
I was given a Nightmare puzzle to do and it has blown me away, i had actually got bored with Sudoku's because they got boring, this one is excellent.
It has taught me more since working on it than any puzzel has, x wing, x-y wing, and swordfish (i'm still having trouble with the concept).
My main question, can this puzzel be done WITHOUT forcing?
Is forcing same as guessing ( i refuse to guess, thats why i ahve bee nwroking on this for 4 freakin days)?
Is there a site that gives simple rules for the solving tech?
thanks for any help!!
help! oct 16 2006
Hi spw, welcome to the forum!
the october 16 Nightmare can be solved with the following techniques:
There may be shortcuts that allow you to bypass some of the easier techniques, but I do not have the time to analyze all the alternatives.
cheers
Ruud
the october 16 Nightmare can be solved with the following techniques:
- Hidden pair (2x)
- XYZ-Wing
- Naked pair (2x)
- Empty Rectangle pattern (2x)
- Unique Rectangle (type 1) (2x)
- Sashimi X-Wing pattern
- Finned Swordfish pattern
- XY-Chain (2x)
- XY-Wing
- X-Wing
- BUG
There may be shortcuts that allow you to bypass some of the easier techniques, but I do not have the time to analyze all the alternatives.
cheers
Ruud