The New Sudoku Players' Forum

[mtr]

(in the Sudoku program)

I've got it this far:

Code: Select all

3.1 2.. ..7
... 1.7 ...
7.6 934 51.

.7. 4.9 18.
9.. .21 7.4
.1. 873 .5.

..9 .4. 371
... 7.2 8.5
..7 3.8 ..6

But bearing in mind that Pappocom puzzles never need you to guess, I can't see any way to progress... I feel stupid

[tso]

Look for several consecutive sets of naked pairs, the naked triples.

[mtr]

Sorry, I must be tired or something, I can't see any. At least, not that are going to help.

[stuartn]

And look at the candidate 5's in block 7 - are they restricted to a particular row? - what does this imply?

stuartn

[tso]

(a) r7c46=[56][56]

... which leads to ...

(b) r89c5=[19][19]
and
(c) r7c12=[28][28]
and
(d) r37c2=[28][28]

and then

(e) r129c2=[459][459][45]

And look at the candidate 5's in block 7 - are they restricted to a particular row? - what does this imply?

stuartn

I don't see this. The candidate 5's in block seven are:

Code: Select all

5 5 .
. . .
5 5 .


[Cec]

Sticking my neck out here but here goes. "mtr" has just joined the forum and told to look for naked pairs and naked triples. Struth! Hope he/she doesn't think they've incorrectly linked to a nudist colony. Good starting points are websites:
(a) http://www.angusj.com/sudoku/hints.php and
(b) http://www.simes.clara.co.uk/programs/sudokutechniques.htm

Even after applying tso's naked pairs detection I'm still left with candidate 5's in both cells r9c1 and r9c2. How is one of these 5's eliminated. Help appreciated by both of us.
Regards Bonsai Cec

[emm]

Hey that's more like the Ozzies I know, Cec!

I can't sort this one out thru the 5s in Box 7 either but doesn't your nudist camp have a naked pair 3,6 in row 5? From there this one falls apart like a pie floater.

PS : If you haven't had the pleasure - a pie floater is a world-famous-in- Australia national dish - a meat pie floating in a bowl of pea soup!!! but then they also have the smallest brain-to-body-weight mammal in the whole world for a national symbol so go figure that.

PPS : I know heeps of lovely Ozzies.

[Cec]

Hey that's more like the Ozzies I know, Cec!

I can't sort this one out thru the 5s in Box 7 either but doesn't your nudist camp have a naked pair 3,6 in row 5? From there this one falls apart like a pie floater...........
PPS : I know heeps of lovely Ozzies.

Gee, thanks em - hope I'm one of the lovely Ozzies you know and you seem a fair dinkum bloke too. However, not sure if we're in the same nudist camp on this one.

tso nicely explains how a triple is determined in r129c2 = [459] [459] [45]
which enables candidate 5 to be removed from cell r5c2 leaving row 5 as follows:
[9][368][358] [56][2][1] [7][36][4]

Where is the naked pair [3,6] in this row?

Regards, Bonsai Cec

[MCC]

tso nicely explains how a triple is determined in r129c2 = [459] [459] [45]
which enables candidate 5 to be removed from cell r5c2 leaving row 5 as follows:
[9][368][358] [56][2][1] [7][36][4]

Where is the naked pair [3,6] in this row?

Regards, Bonsai Cec

Because of the naked pair [2,8] in column 2, the 8 can be eliminated from [r5c2] leaving

[9][36][358] [56][2][1] [7][36][4]

[emm]

Cec, you are definitely by far the nicest Ozzie I have ever met and no offence about the s*x m*xup. (Not sure if I'm allowed to say that word on here but you said 'n*d*st c*mp' first and they let that pass, so I think we're probably still on safe ground!)

The 8 you have as a candidate in r5c2 is wiped out by the 28 n*k*d p**r in column 2 (sorry if this is getting a bit enigmatic - I'm just trying to be careful.)

PS : V sorry to hear about Warney - and you thought he dropped that catch on purpose!

[Edited : Oops, MCC beat me to it, now isn't that appropriate!]

[Cec]

Thanks MCC and Em. Yes, I overlooked removing candidate 5 from r5c2 giving the nxkxd pair [3,6] in row 5 as posted by Em - Ah! what a wonderful sense of humour Em has and hope 'mtr' is following these moves to help solve this puzzle.

For the forum's benefit, my reference to Warney dropping 'that' catch was said in jest as I did acknowledge the best team won. Go easy on me because I might consider applying for chief score board co-ordinator at the next "Ashes" series.
Regards, Bonsai Cec

[Cec]

[quote="cecbevwr"]Thanks MCC and Em. Yes, I overlooked removing candidate 5 from r5c2 ...."]quote

I meant to say "overlooked removing candidate 8 from r5c2".
Bonsai Cec

[sonovapreechaman]

wow!
I certainly found this thread an education - I've been doing sudoku from the newspaper for about 2 weeks now, only got stuck on 2 of them but I'm gonna retry them with the skills you guys have mentioned - thanks guys
p.s. warney might not have dropped the ball if he hadn't been up all night...
...texting!!!

[mtr]

Thanks all. I came back to this this morning and the n*k*d thing clicked; it was pretty straight forward from there.

What a nice forum!

[stuartn]

tso wrote:

stuartn wrote:
And look at the candidate 5's in block 7 - are they restricted to a particular row? - what does this imply?

stuartn


I don't see this. The candidate 5's in block seven are:

Code:

5 5 .
. . .
5 5 .

You must be solving things in a different order to me....

after just the basics I get

Code: Select all

3 [4589] 12 [568]  [56]  [469]  [469] 7
 [2458]  [24589]  [2458] 1 [568] 7 [2469]  [23469]  [2389]
7 [28] 693451 [28]
 [256] 7 [235] 4 [56] 918 [23]
9 [3568]  [358]  [56] 217 [36] 4
 [246] 1 [24] 873 [269] 5 [29]
 [28]  [28] 9 [56] 4 [56] 371
 [146]  [346]  [34] 7 [169] 28 [49] 5
 [1245]  [245] 73 [159] 8 [249]  [249] 6
 


As you can see, block 7 has only two 5's - in row 9. (It also has its only 6's in row 8). Apply the implications of this and it falls apart.

What you meant to say was.....

'I don't see this. The candidate 5's in block seven (the way I do it) are: '

I'm sure you'll agree. I'll PM you the solution sequence if you desire.

stuartn