The New Sudoku Players' Forum

[dailybraintrainer]

Daily sudoku expert online
#145
https://dailybraintrainer.com/sudoku/expert-sudoku/daily-free-online-sudoku-game-expert-145/

[dailybraintrainer]

Daily sudoku expert online
#146
https://dailybraintrainer.com/sudoku/expert-sudoku/daily-free-online-sudoku-game-expert-146/

[dailybraintrainer]

Daily sudoku expert online
#147
https://dailybraintrainer.com/sudoku/expert-sudoku/daily-free-online-sudoku-game-expert-147/

[dailybraintrainer]

Daily sudoku expert online
#148
https://dailybraintrainer.com/sudoku/expert-sudoku/daily-free-online-sudoku-game-expert-148/

[dailybraintrainer]

Daily sudoku expert online
#149
https://dailybraintrainer.com/sudoku/expert-sudoku/daily-free-online-sudoku-game-expert-149/

[dailybraintrainer]

Daily sudoku expert online
#151
https://dailybraintrainer.com/sudoku/expert-sudoku/daily-free-online-sudoku-game-expert-151/

[dailybraintrainer]

Daily sudoku expert online
#152
https://dailybraintrainer.com/sudoku/expert-sudoku/daily-free-online-sudoku-game-expert-152/

[dailybraintrainer]

Daily sudoku expert online
#153
https://dailybraintrainer.com/sudoku/expert-sudoku/daily-free-online-sudoku-game-expert-153/

[dailybraintrainer]

Daily sudoku expert online
#154
https://dailybraintrainer.com/sudoku/expert-sudoku/daily-free-online-sudoku-game-expert-154/

[dailybraintrainer]

Daily sudoku expert online
#155
https://dailybraintrainer.com/sudoku/expert-sudoku/daily-free-online-sudoku-game-expert-155/

[dailybraintrainer]

Daily sudoku expert online
#156
https://dailybraintrainer.com/sudoku/expert-sudoku/daily-free-online-sudoku-game-expert-156/

[Maxito_Bahiense]

Daily sudoku expert online #128
https://dailybraintrainer.com/sudoku/expert-sudoku/daily-free-online-sudoku-game-expert-128/

After basic methods:

Hidden Text: Show

Singles: r4c6=2, r3c1=9, r8c1=3, r1c6=6, r1c4=7, r4c1=6, r4c3=4, r6c2=7.
Locked sets: 5 in r7c23=>r7c8<>5
Simple colouring/skyscraper:1 in r69c1, r59c6=>r5c23<>1.
Singles again: r5c2=2, r5c3=8, r6c1=1, r9c1=2, r7c1=4, r7c2=5, r7c3=7, r7c6=9, r1c1=8, r9c9=5, r9c8=7, r9c6=1, r5c6=7, r5c5=3, r5c4=1, r4c8=3, r2c9=3, r3c2=4, r8c5=7, r6c4=9, (r8c9; r5c8)=9, r5c9=4, r5c7=6, r1c9=2, r1c3=5, r1c7=4, r6c9=8.

...we get to this step:

Code: Select all

*-----------------'------------------'-----------------*
 | 8    3    5     | 7      9    6    | 4     1     2   |
 | 7    16   12a6  | 4     2b5   8    | 9     56    3   |
 | 9    4    2b6   | 2a5b   1    3    | 5b8a  568   7   |
 *-----------------+------------------+-----------------|
 | 6    9    4     | 58    58    2    | 7      3     1  |
 | 5    2    8     | 1      3    7    | 6      9     4  |
 | 1    7    3     | 9      6    4    | 2b5a  2a5b   8  |
 *-----------------+------------------+-----------------|
 | 4    5    7     | 3     2a8b   9   | 1    2b8a    6  |
 | 3    16   16    | 2b8a   7     5   | 2a8b   4     9  |
 | 2    8    9     | 6      4     1   | 3      7     5  |
 *-----------------'------------------'-----------------*

...where I have applied some 3D-Medusa colouring. Since different 5s are tagged with the same parity/label "b" in the same house, this contradiction means that all candidates tagged "a" can be written in.
stte.

Max.

[Maxito_Bahiense]

Daily sudoku expert online #128
https://dailybraintrainer.com/sudoku/expert-sudoku/daily-free-online-sudoku-game-expert-128/

[...]

...where I have applied some 3D-Medusa colouring. Since different 5s are tagged with the same parity/label "b" in the same house, this contradiction means that all candidates tagged "a" can be written in.
stte.

Max.

So, as others point out, "expert" level is somewhat uneven. #128 is Hodoku-rated around 680, but #114 is rated 1735.

Max.

[dailybraintrainer]

Daily sudoku expert online
#157
https://dailybraintrainer.com/sudoku/expert-sudoku/daily-free-online-sudoku-game-expert-157/

[dailybraintrainer]

Daily sudoku expert online
#158
https://dailybraintrainer.com/sudoku/expert-sudoku/daily-free-online-sudoku-game-expert-158/