I used this a while ago and wanted to know what tecnique it would be. . .

Its the sudocue daily nightmare for 22/06/06 (!)

- Code: Select all
`. 6 .|. . .|. . 8`

2 . .|8 . 3|. 7 6

. 1 .|. 9 .|5 . .

-----+-----+-----

. 2 .|. . .|8 . .

. . .|4 8 1|. . .

. . 3|. . .|. 9 .

-----+-----+-----

. . 9|. 6 .|. 5 .

6 3 .|9 . 4|. . 7

4 . .|. . .|. 6 .

After some basic stuff, the puzzle gets to this point, i'm exclusivly focusing on the middle section of the puzzle so thats filled in in full :-

- Code: Select all

.------------.------------.------------.

| . 6 . | . . . | . . 8 |

| 2 . . | 8 . 3 | . 7 6 |

| . 1 . | . 9 . | 5 . . |

:------------+------------+------------:

| 157 2 14567 | 3567 357 9 | 8 14 145 |

| 579 579 567 | 4 8 1 | 67 23 23 |

| 1578 4578 3 | 2567 257 2567 | 67 9 145 |

:------------+------------+------------:

| . . 9 | . 6 . | . 5 . |

| 6 3 . | 9 . 4 | . 8 7 |

| 4 . . | . . . | . 6 9 |

'------------'------------'------------'

We can eliminate both [r6c12] <> 7 and [r6c9] <> 5 The reasoning go's something like this:-

T/M/B= top/middle/bottom of the middle set of 3 boxes.

6 and 7 together go in the middle and bottom of box 6. - the 67 locked set at [r56c7]

In the 5th box 6 and 7 must go one on the top and one on the bottom, if they both went in the top row, 3 could go nowhere in box 5 and if 6 and 7 both went on the bottom it would force an empty square at [r6c7] Therefore Reading across boxes 4,5 and 6:

Given that 6 cannot go on the bottom row of box 4 or the top row of box 6, 6 can be placed:-

TBM or MTB

and

7 can go TBM or MTB or BTM, (the only restriction being not in the midlle row of box 5 or the top row of box 6)

Combining the positions of 6 and 7:

If 6 goes TBM then 7 goes MTB

If 6 goes MTB then 7 goes TBM

Therefore 7 cannot go BTM as its "controlled" by 6 and . . .

Since one of 6 or 7 and 3 goes on the top in box 5, then the digit 5 go's on the bottom of box 5, thus the eliminations,

I was wondering if anyone had anymore similar examples as it would good to easily determine the exact conditions and number of restrictions that would need to be applied for the technique to work, is the logic of this anything like braids analysis?

Thanks, T.