The New Sudoku Players' Forum

[SainsburyR]

I reach a point at which I cannot solve this by logic and have to resort to trial & error. Can anyone explain the logic.

756 341 829
3*2 *** **1
*41 *2* *3*

639 157 284
428 936 715
175 482 963

*** 21* *9*
*** *** 1*2
214 *** 3*8

[helpmeeee]

in the bottom middle grid there are only two squares that the 3 and 4 can go.
therefore when we ignore those two squares, the 8 can only go in one place in that bottom middle grid

[helpmeeee]

ok, i've finished this one. has anyone managed a number in mine ( the post below this) it's driving me insane :'o(

[SainsburyR]

Thanks, that got me going again and I found the same logic useful later on.

[SainsburyR]

When going back over the solution to show a mate I found that I got stuck again. The above pointer enabled me to derive an 8 in row 8 column 4 as well as removing a number of other possibilities. So I now have...

756 341 829
3*2 *** **1
*41 *2* *3*

639 157 284
428 936 715
175 482 963

*** 21* *9*
*** 8** 1*2
214 *** 3*8

How I solved it from this point using just logic I can't work out. Either I saw something then that I can't now or I made a lucky guess without realising it.

Give us a clue!

[scrose]

Look at row 9 to determine what you can eliminate from box 8.
You can now fill a cell in box 7.

[SainsburyR]

Took I while but I finally got it.

[rrabbit]

756 341 829
3*2 *** **1
*41 *2* *3*

639 157 284
428 936 715
175 482 963

*** 21* *9*
*** 8** 1*2
214 *** 3*8

Have a detailed look at box 8.
That will allow some eliminations on row 9,
and you then can fill quite a few cells,
beginning in box 9.


Thomas