|Guestbook||Forbidding chains |
for absolute beginners
Hi, happy new year and best wishes to everyone ! You are in my sudoku sandbox where I put some proofs of puzzles from sudoku.com.au... As wages for all the typing (and grey cells torturing) it involved, I'd gladly read a little word from you in the Guestbook.
New ! Big thanks to Gath who offers us a splendid site, and whose democratic attitude as a webmaster is a model. He kindly heard and answered the request for new material in tough section. All of us crazy solvers appreciate to have new problems to face and solve !
|01-28||01-29||02-01||New! 02-02||New! 02-03||New! 02-04||New! 02-05|
|New! 02-06||New! 02-07||New! 02-08||New! 02-09||New! 02-10||New! 02-11||New! 02-12||New! 02-13|
Please before reading proofs, consider reading notes. Note 1 (notation used), Note 2a (about equivalent puzzles) , Note 2b (what is "type"), Note 3 , Note 4 , Note 5 .
New ! Forbidding chains for absolute beginners : the tip that generalizes all known (naked/hidden pairs, Xwing...) and keeps applying when others fail.
Note 1 about notations :
The notation used (suggested by Andrei Zelevinski) is as follows :
Cells: a1, a2, ..., i9 (as in chess).
Rows: R1, R2, ..., R9 (bottom to top).
Columns: Ca, Cb, ..., Ci (left to right).
Blocks: Bb2, Bb5, ..., Bh8 (labeled by central cells).
Abbreviated justification of moves:
e4=7%cell means (the only possibility for e4 is 7).
e4=7%row means (e4 is the only possibility for 7 in its row R4).
e4=7%col means (e4 is the only possibility for 7 in its column Ce).
e4=7%block means (e4 is the only possibility for 7 in its block Be5).
Such moves will be referred as "easy (or simple) eliminations".
A notation tutorial for absolute beginners.
Antitroll . 05/11/2005 : Hi all from sudoku.com.au, allow me a last self-contradictory post.
It's now 2 days that my nickname is quoted far more than my modesty can afford on comments (self-contradiction : this comment is once more about me...but it's the last one as for me).
1) Please remember that my english is very poor, with 2 consequences :
a) I love non-sudoku comments, they often make me lol (the KQRP soap is a must!), but I'm in fear of entering in such discussions by lack of vocabulary (by the way thanks HH for mentioning Liam's pic : I was quite moved).
b) I'm talking only technical : for sure, my 50 or 100 english words are far enough for talking sudoku !
2) Some people on Internet have a passion : make forums talk about them ( it's called trolling), I definitely don't ! So pro-gbs, please answer no more to antis, and anti-gbs, practice the best strategy against trolling : ignore me !
3) antis : please have a look at former boards, you'll see that apart from each day's puzzle presentation, that I very well can stop, most of my posts are replys to questions from users. Please also have a look at
http://sudoku.com/forums/, you'll see what are technical forums!
4) pros : once more, though I most appreciate your reactions, please do no more answer to antis, in fact I agree with them when they make me realize that I'm invading the board with my comments !
5) pros and cons : anything more on the subject? use this Guestbook. in order to pollute no more sudoku.com.au's forum.