Sudoku Puzzles

Okay....ATTENTION...ATTENTION

All guesses for the competition have been lost!!!!

You will need to redo them if you wish to be a part of the competition

Competition.....Competition.......Competition

Guess the weight and date of arrival of my Grandbaby. Click on 'competition' and be in the running for 6 months free membership that Gath has so graciously offered.

To all who wish to take part in the competition...

If you go to 'check out my page' after my name you will see a photo of Nicole at 37 weeks. This may help in your guess. Some of you may wish to revise your guess...lol....Maybe the 'BIG CRASH' was a good thing

Good morning to all!

'Hello. Is this the party to whom I am speaking?'

14:09

I can't believe I was able to do all 4 puzzles

Pretty Miss Emily.
This puzzle seemed awfully easy to me.

Hello everyone, looks like we've bounced back from Emily's baby pictures to Emily at age 5 (current age). Have a great weekend all!

hello Emily !

Hello!!

26:06

Today's puzzle is one of those that has so many fc's available, it is more difficult to pare down the proof then perhaps it is worth. I believe that a depth 4 proof is possible, but I just kept finding depth 5 steps. The depth 4 steps that I did find did not quite solve the puzzle, but I am fairly confident that I have missed the obvious today.

Possible proof of tough sudoku of 12 03 06:
1) Start at 23 filled - the given puzzle. Unique Possibilities to 28 filled. (UP 28).
2a) Hidden triple 345 at b23c2 forbids b3=289,b2=89,c2=9
2b) Pair 48 at i29 forbids i8=4
2c) {pair 45 at bc2} == {pair 35 at bc2} -- d2=35 == d2=1 -- d9=1 More...

Perhaps step 2c is more easily understood as follows:
d2=1 == {triplet 345 at bcd2} -- i2=4 == i9=4 -- d9=4 == d9=1 forbids d47=1, e2=3,h2=4,h9=4.
Note that this is a wrap around chain.

8:51

Steve, if you missed anything obvious then so did I. My proof ended up looking at lot like yours:

1) Start 23, Unique Possibilities to (UP) 28.
2) Hidden triplet 345 at b23, c2 forbids b2=89, b3=289, c2=9.
3) Naked pair 48 at i29 forbids i8=4.
4) The wraparound chain d2=1 == More...

Quite a good but easy one.

don't understand the nomenclature wihat does 'Start 23, Unique Possibilities to (UP) 28.' mean?

phil: 'Start 23' means the given puzzle. 'UP 28' means that one should be able to find the next 5 (28 - 23) cells by the most basic logic.

Thanks JL. So there are 23 cells filled in, I only see 3 more UPs ( a 7 8 and 9).

Can you tell me more about the numbering? For example where is b23 (a row a column a square?), c2, i29?

Columns are a to i, left to right.
Rows are 1 to 9, bottom to top.
b23 is short way of saying b2 and b3

Oct. 30, 2007.

SE=7.2

editorial hidsight - UP=28
1.(28=9)g34-h2=e2-('17)e2f1=(1)d2-d9=('17)gh9 => g9<>8,h2<>1 UP=30
2.(6=2)a5-a1=(2-9)b1=b8-(9=256)g8i78 => i5<>6 UP=81.

note: syntax ('nm) denotes almost hidden set nm.