## Locked candidates1

Advanced methods and approaches for solving Sudoku puzzles

### Locked candidates1

Having read the excellent website http://angusj.com/sudoku/hints.php which explains how candidates can be excluded by the existence of "Locked Candidates 1" (and 2) I am stumped with the following Simple Sudoku puzzle which hints a "Locked candidates 1" situation exists in cells r9c4 and r9c5 of a puzzle which I assume needs to only show the lower band (Boxes 7,8 and 9) to receive a reply.

Row 7 [7][129][12] [8][5][6] [29][3][4]
Row 8 [15][128][12458] [134][123][9] [258][6][7]
Row 9 [3] [689][4568] [14][12][7] [2589][128][129]

After deducing candidate 6 can only occupy one of two cells in the bottom row (r9c2 or r9c3) I can't see how other candidates can be excluded. Any help would be appreciated but please go easy on me, I'm still grieving over a recent cricket match.
Regards Bonsai Cec
Cec

Posts: 1039
Joined: 16 June 2005

Maybe someone else can help from what you've posted, but for me I'd really like to see the whole puzzle, just so I can get the gist of what's going on around these rows.

Sorry for your loss, but I'm over the proverbial orbital satellite. I think it was about 4:30pm yesterday (Ashes time) when my pulse rate finally dropped below 140 bpm, where it must have been since mid-July. I can only recommend you download the Embrace track 'Ashes' - not to rub it in at all, but it's a stunning track.
Karyobin

Posts: 396
Joined: 18 June 2005

cecbevwr

You state a "Locked candidates 1" situation exists in cells (r9c4) and (r9c5).

So the answer must lie within those cells.

Looking at the 1's in row 7 they locked in box 7, so,
all other 1's can be eliminated from box 7.

This locks the 1's in row 8 to box 8,so,
all other 1's can be eliminated from box 8 including from cells (r9c4) and (r9c5).

This leaves the 4 and 2 to be placed in cells (r9c4) and (r9c5), with all other 4's and 2's eliminated from box 8 and row 9.

The 6 is already locked to (r9c2) or (r9c3) as a 6 has been placed in both (r7c6)and (r8c8).

If not, I'm sure someone else will correct me.
MCC

Posts: 1275
Joined: 08 June 2005

The 1s are locked into row 7 in box 7 and row 9 in box 9 => must be in row 8 box 8 => delete 1s from r9c4 r9c5.

So sorry about the cricket, Cec, (and the rugby!)
emm

Posts: 987
Joined: 02 July 2005

### Locked Candidates 1

Thanks to Karyobin, MCC and em for your above explanations enabling me to complete the puzzle. Seems so obvious when it is explained. What would I do without you people. Must go - running late to get to cricket practice.
Regards Bonsai Cec
Cec

Posts: 1039
Joined: 16 June 2005

What a nice Australian!
emm

Posts: 987
Joined: 02 July 2005

Yes, but I've never met a nice South African. Not entirely sure what I did to help, mind you.

Might I suggest you practice playing reverse swing?

Or any swing, for that matter.
Karyobin

Posts: 396
Joined: 18 June 2005

I think you and Cec really connected on the cricket, rather than the puzzle.

PS : I'd like to extend an apology to the South African community for remarks made by the previous correspondent which in no way reflect the opinion of this forum - funny how a little success can go to the head when you're not used to it!
emm

Posts: 987
Joined: 02 July 2005

Yes. I'd like to extend my apologies for it as well. 'tis a reference to the 'B' side of an 80's single - a rambling collection of preposterous confessions, repetitively tied together by an insulting qualification of my earlier assertion.

The 'A' side was the inexplicably popular 'Chicken Song' and both were performed by the cast of satirical puppet shoe Spitting Image.

I happen to know two South Africans. They're both lovely.
Karyobin

Posts: 396
Joined: 18 June 2005

Ah, I get it – a double implication forcing chain - I missed the bilocation link. (It must be quite tiring being your brain!)
emm

Posts: 987
Joined: 02 July 2005

Can be quite tiring living with it, certainly.
Karyobin

Posts: 396
Joined: 18 June 2005