dailysudoku.com

[Hollydoll]

I am having trouble figuring out the 'naked quadruple' of Sept 24 - I need to see and try another puzzle which has that in it. Any suggestions?

[Alnasi]

Yeah, try March 17. You'll need to do two of them to break that bad boy.

[Hollydoll]

Help - haven't even seen a naked quadruple. I am not very good at finding hidden couples either. I would appreciate a few hints. Thanks.

[someone_somewhere]

Hi,
I can supply you only a "naked triple":
from the Sunday Time Magazine - Su Doku 9: September 25, 2005:

003000400
000304001
090060070
300250000
400000006
000079002
040090020
800502000
005000100

you will (probable) not be able to solve it if you do not see the
naked triple (tip the numbers 1,6,7) after a "hidden pair".

good look and good luck!

see u,

[Kiwi]

[someone_somewhere]

Hello Kiwi,
17 mar needs only "hidden pair", can you see if I am right or wrong:

Initial SuDoku Table

- - - 9 1 - - - -
3 - - - 2 - - 1 -
- 7 5 - - 8 6 - -
- 5 2 - - - - - -
6 - - 5 - 9 - - 7
- - - - - - 1 8 -
- - 6 8 - - 9 4 -
- 8 - - 5 - - - 2
- - - - 9 4 - - -

1 in r3c1 5 in r6c9 5 in r7c1 - Unique Horizontal
2 in r3c8 2 in r5c7 - Unique Horizontal
9 in r3c9 - Unique Horizontal
9 in r4c8 - Unique Vertical
6 in r4c9 - Unique in 3x3 block
4 in r4c7 - Unique in 3x3 block
3 in r5c8 - Unique in 3x3 block
6 in r6c5 - Unique Vertical
3 not in r1c6, it is in r3c4 or r3c5 (Row on 3x3 Block interaction)
4 not in r2c4, it is in r3c4 or r3c5 (Row on 3x3 Block interaction)
3 not in r6c4, it is in r4c4 or r4c5 or r4c6 (Row on 3x3 Block interaction)
3 not in r6c6, it is in r4c4 or r4c5 or r4c6 (Row on 3x3 Block interaction)
7 not in r8c4, it is in r7c5 or r7c6 (Row on 3x3 Block interaction)
7 not in r8c6, it is in r7c5 or r7c6 (Row on 3x3 Block interaction)
7 not in r9c4, it is in r7c5 or r7c6 (Row on 3x3 Block interaction)
1 not in r8c3, Hidden Pair 4 9 in r8c1 and r8c3 (in Row)
3 not in r8c3, Hidden Pair 4 9 in r8c1 and r8c3 (in Row)
7 not in r8c1, Hidden Pair 4 9 in r8c1 and r8c3 (in Row)
7 not in r8c3, Hidden Pair 4 9 in r8c1 and r8c3 (in Row)
1 not in r7c6, it is in r8c4 or r8c6 (Row on 3x3 Block interaction)
1 not in r9c4, it is in r8c4 or r8c6 (Row on 3x3 Block interaction)
7 not in r9c7, it is in r8c7 or r8c8 (Row on 3x3 Block interaction)
7 not in r9c8, it is in r8c7 or r8c8 (Row on 3x3 Block interaction)
1 not in r9c3, Hidden Pair 3 7 in r6c3 and r9c3 (in Column)
4 not in r6c3, Hidden Pair 3 7 in r6c3 and r9c3 (in Column)
9 not in r6c3, Hidden Pair 3 7 in r6c3 and r9c3 (in Column)
1 in r5c3 - Unique Vertical
8 in r4c1 8 in r5c5 - Unique in 3x3 block
4 in r6c4 - Unique in 3x3 block
4 in r3c5 4 in r5c2 2 in r6c6 2 in r9c4 - Unique in 3x3 block
3 in r3c4 2 in r7c2 - Unique in 3x3 block
2 in r1c1 1 in r9c2 1 in r7c9 - Unique in 3x3 block
3 in r9c3 3 in r8c7 - Unique in 3x3 block
3 in r1c9 3 in r6c2 7 in r9c1 7 in r8c8 - Unique in 3x3 block
4 in r2c9 7 in r6c3 9 in r6c1 9 in r8c3 6 in r9c8 - Unique in 3x3 block
4 in r1c3 9 in r2c2 4 in r8c1 5 in r9c7 - Unique in 3x3 block
6 in r1c2 8 in r2c3 5 in r1c8 8 in r1c7 8 in r9c9 - Unique in 3x3 block
5 in r2c6 7 in r2c7 - Unique in 3x3 block
6 in r2c4 7 in r1c6 6 in r8c6 7 in r7c5 - Unique in 3x3 block
7 in r4c4 1 in r8c4 3 in r7c6 - Unique in 3x3 block
1 in r4c6 3 in r4c5 - Unique in 3x3 block

Final SuDoku Table

2 6 4 9 1 7 8 5 3
3 9 8 6 2 5 7 1 4
1 7 5 3 4 8 6 2 9
8 5 2 7 3 1 4 9 6
6 4 1 5 8 9 2 3 7
9 3 7 4 6 2 1 8 5
5 2 6 8 7 3 9 4 1
4 8 9 1 5 6 3 7 2
7 1 3 2 9 4 5 6 8

see u,

[David Bryant]

[Kiwi]

David - couldn't agree with you more. I think some of the explanations get much more complicated than they need to because of the terminology. Good to remember KISS principle ..... Keep It Simple Stupid!!