RULES : Classic Sudoku rules apply. Cells with grey circles will contain only odd digits. Cells separated by white dots will contain consecutive digits. Not all possible dots are marked.
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A very happy new year to all of you. Welcoming the new year with a thermo sudoku. I had created this sudoku before the 2019 themed thermo s... -
RULES : Classic sudoku rules apply. Adjacent digits along each marked line have a difference of at least 5. -
Triple Sum Sudoku for GP practice RULES : Each row is divided into 3 parts. The 1st part is a 4-digit number, the 2nd part (sh... -
RULES : Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 box. Solve Online -
RULES : Classic Sudoku rules apply. Additionally, each group of nine shaded cells must also contain the digits 1 to 9. Online Solving -
RULES : Classic sudoku rules apply. If a grey circle is given between two adjacent cells, then the numbers in those cells will be consecu... -
It is an amazing feeling to reach 200 sudokus on my blog today. I had started this blog in the year 2017. The year 2020 started with Sudoku... -
This classic sudoku is taken from my new book WORLD OF SUDOKU : VOL # 4. The book contains 120 handcrafted classic sudokus ranging from mo... -
My daughter is a big fan of BTS. So here is a BTS themed thermo sudoku on her order :) RULES : Classic sudoku rules apply. Additionally, ... -
RULES : Classic sudoku rules apply. Additionally, orthogonally adjacent cells cannot contain consecutive digits. Also, a digit cannot repe...
Puzzle No. 428: Lockout Lines Sudoku
RULES: Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box. End...
Very nice. I found the SET and the implication instantly this time. After that, I just spent 30 minutes missing obvious deductions. Then I started it all again and everything clicked all right in a matter of 7-8 minutes.
ReplyDeleteThanks Edouard. This was easier compared to the previous sudokus that used set theory.
DeleteHow to use SET here? I solved this without a clue about it in 15:17.
ReplyDelete@kishy
ReplyDeleteOn the one hand, take rows 1, 5 and 9. On the other hand, take columns 2, 5 and 8. Remove the common cells.
You're left with two equivalent sets of 18 digits.
You know by the rows that these sets contain 12 odd digits and 6 even digits. This gives valuable information on the consecutive triplets in the columns.
Bingo ! You got the intended logic.
Delete